Quote:
Originally Posted by sednwol
My mechanic told me 20w50 oil can be harmful for my Au VCT (250000klm). Car appears to be burning oil and also several leaks. Is this correct, and if so what oil do you suggest? Expensive oil is difficult as I have to top up every fortnight, not a huge amount but enough to be expensive. Also do products like Wynns Stop Leak Engine Treatment work? They claim it rejuvenates seals. A few questions here sorry.
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Re: Specified Engine Oil for AU 4.0 Litre I6 Engines.
4.0 Litre S.E.F.I
4.0 Litre I6HO
4.0 Litre VCT
Type:
5W-30 ILSAC-GF2
Specification: WSS-M2C910-A1
Obviously if the engine is burning oil & it's also being lost through leakage.
You're not going to be buying Redline Synthetic at around $85.00 for 3.785 litres.
Engines burn oil if the oil gets into the combustion camber.
Normally, there are two possibilities where this can happen, via the piston rings &/or via the valve guides.
Oil seals are subjected to heat from the oil.
If you've ever dropped a sump plug into the oil container when changing the oil, you'll know how hot engine oil can be.
You certainly aren't going to stick your hand in it for long.
Exposure to heat over time will cause the seal to become harder & less flexible.
Add to this the oil seal wears where it contacts the shaft.
Not only does the seal wear, but also the shaft.
You may be aware of "Speedy Sleeves" as a means of repairing this shaft wear.
At the end of the day, the only way to rectify oil leakages through seals is to replace the seals & if necessary do something about grooves in the shaft.