Oil

[pingu_turbo]

Ive got a gte and its time to service the engine. I usually use 10/40wt castrol. I was wondering if its worth spending the xtra money and getting fully synthetic? And also would i be able to use the lower viscosity 5/30wt? I wasnt sure as they recomend that for modern engines.
Can anyone help?
Cheers

[Stuart]

im running Comma semi synth (same stuff as vauxhall sell) thats good enough for my liking.



and why the hell would you want to run such a low viscosity??? lol 10 or 15/40 is fine

we dont live in the north pole so oil can be a bit thicker in the uk.

[mikeoxford]

ive always used 15w40 castrol gtx

as thats what chris_w always used in her before i bought it.

on a new engine now though lol - still use the same oil though.

*touches wood*

ive never had any major noise issues like tapping etc.

and i havent really had any major oil leaks. none that havent been rectifable or because of a deteriated gasket or something.

down to personal choice at end of day

[Aragorn]

castrol has had some crappy reviews cos it has a high ash content which causes it to sludge up easier/earlier than other oils

i use halfords or granville stuff in mine and i change it every 3k

ive heard good things about mobil 1

[_JH_]

I've always thought putting fully synthetic into an old engine previously run on semi or mineral caused hard build ups which lead to failure.