What oil is best

[Gt4.8BAR]

Hi iv always used 10/40 Mobile one oil in my st185 gt4 but thinking of going for Fuchs 10/50 any one use this stuff and worth it? Thanks 

Edited 1 May 2024 by Gt4.8BAR

[slybunda]

As thin as possible, as thick as necessary.

Going thicker on oil is not always good 

[bazz54]

Well, if you are talking about which brand is best, a friend of mine was a PhD chemist working for an oil company. When asked which oil he used his reply was "Whichever big-name brand is on special offer in the supermarket".

 

If we're taking viscosity, I go with Slybunda. Looking at Toyota Data, generally, over a period of years, they've moved to recommending thinner oils than they used to for a given engine. We still have relatively mild (warm) winters in the UK. It all goes back to the old oil advert which claimed that more engine wear was done starting up and reversing off the drive on a cold morning than in the next 100 miles. Whatever happened to oil adverts?

Edited 9 May 2024 by bazz54