Oil leaks on the Volvo V70 do occur and need to be taken seriously. From a sweating rocker cover gasket to a leaking oil seal: engine oil that disappears unnoticed can lead to extra wear, smoke and in the worst case engine damage. What are the most common leak points, how do you recognise them and what can you do about them?
Is it actually engine oil that’s leaking?
A damp patch under your car is not always engine oil. On the Volvo V70 various fluids can leak that look similar. Engine oil is usually brown to black and feels greasy. Transmission oil is often reddish, while power steering fluid ranges from red to amber. Brake fluid is thinner and less oily, usually light yellow.
A practical check: is the engine oil level dropping and is the patch under the engine block or on the timing side? Then it is probably engine oil. Not sure? First check the oil level with the dipstick before taking any further steps.
‘ Some leak points are relatively easy to fix, others require more labour. ’
Where can my V70 start leaking oil?
The Volvo V70 has several points where oil leaks can occur. Some leak points are relatively easy to fix, others require more labour.
Rocker cover gasket
A leaking rocker cover gasket is common on many Volvo engines. Oil then seeps down the side of the engine and can end up on hot components. You recognise this by a greasy build-up along the cylinder head and a burning smell after driving. Sometimes you see oil around the top of the engine.
Oil sump gasket
The gasket or bead of sealant at the bottom of the engine block can start leaking as it ages. You will then see drips under the engine and oil traces on the subframe. This type of leak becomes especially visible after the car has been standing still, when the oil collects and drips onto the ground.
Crankshaft oil seal and camshaft oil seal
Leaking oil seals cause oil in more difficult-to-access places. At the front of the engine you will then see oil traces behind belts or pulleys. The timing area can become wet, which also affects the drive belt. This type of leak is harder to pinpoint without cleaning the engine first.
Oil filter and oil filter housing
An incorrectly fitted oil filter or a worn seal can cause oil loss. This sometimes happens shortly after a service. You will then see oil around the oil filter housing dripping onto the undertray. After every oil change, check that the filter is correctly tightened.
Oil pressure switch and sensors
Small components such as an oil pressure sensor can cause persistent leaks. This is sometimes hard to see without a thorough clean. Oil will then appear around electrical connections and slowly build up.
Turbo oil lines
On turbocharged versions of the V70, oil feed and return lines can leak. You recognise this by oil around the turbo, smoke or a burnt oil smell. You may also see oil deposits on heat shields.
How do I recognise an oil leak?
You can recognise an oil leak by several signs. The oil level drops regularly, even if you’re not driving big mileages. Dark patches appear under the car on the drive or floor. After driving you smell burnt oil, especially on shorter trips while the engine is still warming up.
Regularly look under the bonnet and pay attention to the following points:
- Greasy deposits around the rocker cover or cylinder head
- Oil traces near the oil filter or sump
- Wet patches at the front of the engine
- Smoke from the engine bay
- Oil on belts or hoses
A useful method is to clean the engine first, take a short test drive and then check again where the oil appears first. That way you find the real source rather than just the place where the oil ends up.
Oil leak via the filler cap or crankcase ventilation
Sometimes it looks as if oil is coming out via the filler cap. This may point to a cap that does not seal properly, but also to a blocked crankcase ventilation system (the system that controls the pressure and vapours in the crankcase). If the crankcase ventilation becomes blocked, the engine builds up pressure, causing gaskets and seals to start leaking. On some Volvo engines this is a known issue.
A sucking or whistling noise after switching off the engine can be a sign of pressure problems in the crankcase or ventilation system. This calls for an inspection and possibly cleaning or replacement of the crankcase breather (the part that vents pressure from the crankcase).
‘ The first impression can be misleading because oil runs a long way down before it becomes visible. ’
Leak between engine and gearbox
Oil that appears between the engine and gearbox is not automatically a gearbox problem. The oil often comes from a seal or gasket higher up and runs down. Possible causes are a rear crankshaft oil seal, an oil leak from above that runs backwards, or a leak at the rear edge of the sump.
This type of leak is difficult to assess without first cleaning the engine and inspecting it again. The first impression can be misleading because oil runs a long way down before it becomes visible.
Do I need to repair the leak straight away?
Small leaks can continue seeping for a long time without immediately causing dramatic oil consumption. Even so, it is wise to take action. Oil on hot components causes a burning smell and can eventually damage rubber components. Oil can also get onto the auxiliary drive belt (the belt that drives several auxiliary units) or other drive components, leading to slip or damage.
Take action immediately if:
- The oil level drops regularly
- Oil gets onto exhaust components or belts
- There is smoke or a burning smell
- The bottom of the engine is clearly wet
Do not continue driving if the oil level is dropping quickly. Too little engine oil leads to extra wear and can cause serious engine damage. Have the car checked on a lift or at a workshop to locate the source.
What does it cost to repair an engine oil leak?
The costs vary greatly depending on the source of the leak. A new oil filter or filler cap costs little and is quickly replaced. Replacing a rocker cover gasket takes more time and labour. For an oil seal, a lot often has to be dismantled, which significantly increases labour costs.
Repairs may include:
- Refitting the cap or filter
- Replacing gaskets
- Cleaning or renewing crankcase ventilation
- Replacing oil seals
- Repairing turbo oil lines
Always ask for a quotation in advance and have the source of the leak clearly identified. Sometimes several leak points are tackled at the same time to avoid duplicated labour.
‘ Note: topping up does not fix the leak, but it does prevent immediate damage to the engine. ’
Which oil should I use?
The correct engine oil depends on the model year and engine type of your V70. For most models Volvo specifies a particular viscosity and quality. Check the owner’s manual or the sticker under the bonnet for the correct specification. Always use engine oil that meets the Volvo standard for your engine.
Check the oil level regularly, especially if you already know there is a leak. Top up when the level drops below the minimum. Note: topping up does not fix the leak, but it does prevent immediate damage to the engine.
Practical tips for V70 drivers
Check the engine oil level with the dipstick or via the electronic system. Regularly look for oil patches on the drive or on the undertray. After driving, smell around the engine bay: a burnt oil smell is a warning sign. Visually inspect the engine for oil around the rocker cover, filter, sump and turbo.
With an old leak, the engine is often already dirty. First clean the suspected leak area, take a short test drive and then check again where the oil appears first. This helps you find the real source.
If you are buying a V70, it is sensible to look at the car from underneath after a test drive. Look under the engine protection plate where oil can accumulate. Check maintenance invoices for previous work on gaskets, seals or ventilation components. A car with dubious oil traces should always be inspected on a lift.
On the Carnews website you will find much more information about maintenance, known issues and practical tips for the Volvo V70 and other models. Discover useful articles about car problems, maintenance schedules and technical background information that help you look after your car better.
Frequently asked questions
Common causes of oil leaks on Volvo V70s include a leaking rocker cover gasket and a worn gasket or bead of sealant on the oil sump. Crankshaft and camshaft oil seals also leak regularly, as do components around the oil filter or oil filter housing. In addition, leaking oil pressure switches/sensors and oil feed or return lines for the turbo are common. Finally, a blocked crankcase ventilation system can cause overpressure, making various gaskets and seals start to leak.
Start by checking that it really is engine oil (colour and thickness) and that the oil level is dropping. Clean the engine block around the rocker cover, oil filter, sump and (on turbo cars) the turbo, drive a short distance and then look to see where the first wet patch appears. Look for oil around the top of the engine (rocker cover), at the bottom by the sump, near the oil filter housing and between the engine and gearbox. After a drive, smell around the engine bay for burnt oil and regularly check the oil level; if it drops quickly, do not continue driving but have it investigated.
If you ignore an oil leak, you run the risk that the oil level will become too low, meaning the engine is not lubricated properly and internal components will wear more quickly or even seize. Oil on hot parts (exhaust, turbo) can cause smoke, a burning smell and, in extreme cases, a risk of fire. Leaking oil can damage rubber, belts and other parts, which in turn causes extra faults and costs. In the long run, what seems like a minor leak can result in expensive engine damage or the need for an overhaul/replacement of the engine.
Possible repair options for a V70 oil leak include replacing or resealing the rocker cover gasket, oil sump gasket, crankshaft or camshaft oil seals, oil filter (housing), oil pressure switch and (on turbo cars) oil feed and return lines, plus possibly cleaning/replacing the crankcase ventilation system. DIY costs are roughly between €30 and €200 for parts and consumables, depending on the source of the leak. Professional repairs generally range from around €150–€400 for simple leaks (gasket, cap, filter) to €400–€900 or more for labour-intensive jobs such as crankshaft oil seals or turbo oil lines. For unclear leaks, (paid) diagnostics and cleaning are often required first, which adds extra cost.
Yes, as preventive measures you can regularly check the oil level and the underside of the engine (sump, oil filter, turbo lines) visually and, at every service, ask for the car to be checked for leaks from underneath as well. Replace known weak points such as ageing gaskets (rocker cover, sump) in good time, and have the crankcase ventilation/PCV system checked regularly and cleaned if necessary, because overpressure can trigger leaks. Also pay attention to smells (burnt oil) and any smoke from the engine bay after a drive to spot an early leak. If in doubt, first clean the engine thoroughly and after a short drive check where new oil traces appear first.