Parts for your 2009 Nissan Serena-Oil seals

2009 Nissan Serena oil seals — what they do and when to replace them

Technical sources confirm the 2009 Nissan Serena (C25, typically with the MR20DE 2.0 petrol and RE0F10A/JF011E CVT) is fitted with multiple oil seals across the engine and transaxle. The Nissan Serena C25 Workshop Manual (Engine Mechanical – MR20DE) details procedures for the front and rear crankshaft oil seals, and the CVT section lists left/right drive shaft (differential) oil seals. The JATCO JF011E service information also specifies differential side oil seals, and the Nissan FAST electronic parts catalogue includes entries for “Oil Seal—Crankshaft” and “Oil Seal—Drive Shaft” for this model year. So yes—oil seals are absolutely used on a 2009 Serena.

On this Serena, oil seals keep engine oil and CVT fluid where they belong while keeping dust and water out. They live at key rotating points—front and rear of the crankshaft, around the cam(s), and on the CVT’s output/differential where the drive shafts plug in. When they’re healthy, they prevent drips on the driveway, stop belts from getting oily, and protect the CVT from running low on fluid.

They’re not a scheduled replacement item, they’re replaced on condition. During regular servicing, a good workshop will check under the bonnet and undertray for misting or drips around the crank pulley, timing cover, bellhousing seam, and the inner CV joints. In NZ and Australia, noticeable leaks can also raise WOF/roadworthy issues, so it pays to get onto them early.

Common tell-tales include:

• Fresh oil around the crank pulley or slung onto the lower splash guard (front crank seal)
• Oil tracking from the engine–transmission join (rear main seal)
• Reddish CVT fluid near the inner CV joints (CVT/diff axle seals)
• Burnt-oil smell after a drive, or belt squeal if oil reaches the auxiliary belt

If a seal is weeping, plan the job with other work to save labour. For example, tackle the rear main seal if the transmission is already coming out, or replace axle seals when swapping a driveshaft or doing CVT work. The front crank seal is usually done with the crank pulley removed. A competent mechanic will check the sealing surface for grooves, use the correct installer so the seal sits square, lightly oil the lip, and torque everything to factory spec. Genuine or high-quality OEM seals are strongly recommended—cheap ones can harden quickly.

As a rule of thumb, ask for a leak check every service interval and definitely before long trips. Catching a seep early is far cheaper than dealing with a low-oil or low-CVT-fluid failure later.

Popular questions about 2009 Nissan Serena oil seals

Do all 2009 Nissan Serenas have oil seals?
Yes. The MR20DE engine uses front and rear crankshaft oil seals (and other minor seals), and the RE0F10A/JF011E CVT has drive shaft/differential oil seals. These are documented in the C25 factory workshop manual and JATCO service information. They’re standard wear components on any internal-combustion Serena of this year.

Can it be driven with a small oil-seal weep?
A light mist can sometimes be monitored short term, but it should be assessed promptly. Leaks can worsen, contaminate belts, and in the case of axle seals, drop CVT fluid and risk transmission damage. For WOF/roadworthy and engine longevity, it’s best to repair sooner rather than later.

What does replacement usually involve?
Front crank seals require crank pulley removal, rear main seals need the transmission out, CVT axle seals are replaced with the shaft out. Labour varies with what else is being done. Many owners time these jobs with related work (e.g., driveshaft replacement or transmission service) to keep costs sensible.