What are piston shells?

Answered by Docfixit (expert)
18,416 answers provided

apparantly piston shells are at the bottom of the piston so they would be lubricated by the oil.

Response from downing61
1 question asked

I would be shocked if oil damaged a piston in any way. There are other parts that are much more lubrication dependent such as the bearings that would fail long before a piston would.Sounds like they are just looking for a way out of warranty coverage.

Answered by Wrenchtech (expert)
14,713 answers provided

I agree rod bearing failure because of oil they are looking for way off hook

Answered by Docfixit (expert)
18,416 answers provided

thanks guys after talking to them today they tell me its big ends that has gone, the first service they used carlube oil XAL050 15w40 which is semi sythetic the second they used carlube XGf055 5w40 fully sythetic and the last one just says pro m100 5w40 and I am told these are not the right oils and now I face a bill of over £3000 the previous garages tell me it is recommended oil but hyundai say not I am very confused

Response from downing61
1 question asked

Here are the engine oil requirements for that vehicle

Engine Oil

API Classification SJ or SL
ILSAC Classification GF-3 or above

Viscosity:
All temperatures SAE 5W-20, SAE 5W-30
Above 0°F (-18°C) 10W-30

Answered by Wrenchtech (expert)
14,713 answers provided