what oil would be best for an my 02 bugeye sti wich is remaped and running 330-340 bhp? im off down the coast in 2 weeks so it could do with new oil and filter not sure if semi synthetic or full synthetic is best. thanks.

 

5/40 shell helix ultra, top oil imho.

 

or shell helix 10/40 plus semi synthetic.

 

If the car is a daily drive, go for a 5w-40 which will be fully synthetic. If you track the car, a 10w-50 may be better.

It's worth using a fully synthetic oil as they protect the engine better, last longer and still retain their properties at higher temperatures, making them better for tuned engines or engines that are worked hard.

Have a look at these

5w-40, 5w-40 oil, 5w40, 5w/40

The Silkolene Pro S, Motul 300V and Redline are the top of the range oils and about as good as oil gets. The Fuchs Titan Supersyn or Motul 8100 X-cess are good cheaper alternatives.

Remember you get 10% discount of the public prices for being a Scoobynet member.

Cheers

Tim

 

Oilman, is 5W recommended for New Ages because it's low temp 5W viscosity makes the AVCS heads work better or something?

If not, why is 5W recommended for New Ages, and 10W for the Classics, as lowest 'cold', viscosities?

 

The 5w and 10w numbers refer to the cold vicosity, with a 5w being thinner than a 10w when cold. As it's thinner, it will flow better and get to the head quicker, so that is probably the reason for the change in recommendation. A 5w-40 and a 10w-40 will be the same viscosity when hot, so there is no difference when they are up to temperature. Handbooks give the basic oil recommendation as the cars are sold in many countries and sometimes certain grades can be difficult to get hold of. A 5w-40 is preferable to a 10w-40 in the older Imprezas as they will still benefit from the increased flow rate when cold.

 

A lot of owners on here would challenge that a 5W is too thin a cold viscosity for the EJ engine (10W being their prefered choice). Do they have any grounds for thinking this? Or, out of the two, is the 5W definitely the best to use?

What about 15W - is this suitable too?

 

5w or 10w are ideal for the uk, with 5w being slightly better for cold start (flows quicker when cold then a 10w).

 

Been using 5/40 for 2 years on my classic with no problems at all, @ 400 bhp.

 

Okay, thanks. Makes sense.