oilman

The Castrol is a good oil but I would not run 5w-30 on 320bhp on a 2003 model. I would probably stick with the 10w-50, this is will cover everything from normal road use to hard road use and track use if you plan to do it. Have a look at the Fuchs Pro S 10w-50 and the Millers CFS 10w-50 here https://www.opieoils.co.uk/c-659-10w50-engine-oil.aspx Cheers, Guy

Hi Danny, I have replied to your other thread asking for a few details. Cheers, Guy

Viscosity is not really an indication of quality, 10w-50 is just thicker across the temp range than a 5w-40. If you look at ranges such as the Millers CFS, Fuchs Pro S, Motul 300v etc where they have multiple viscosities in the same quality range the only difference really is the viscosity. Cheers, Guy

Our look up guide just runs off our standard recommendation for your model, 5w-40. Often people use 10w-50 for many different reasons and we often do recommend a 10w-50. What year is your Impreza? Is it modified and what kind of use does it get? Just road or track as well? Cheers, Guy

Hi David You could top up with either of them, not a problem, just make sure it meets the API SN spec. A 0w-20 is likely to burn off quicker than a 5w-30. Cheers Tim

Hi David 5w-30 is an option for the engine and it's cheaper than 0w-20, so a dealership will tend to go for 5w-30. You might find with a 0w-20 that you get better economy or performance due to reduced internal resistance. Any of the 0w-20s via this link will be fine for it. https://www.opieoils.co.uk/c-2024-api-sn-petrol-engine-oil.aspx Regards Tim

Do you get any piston slap when cold? Cheers Tim

Hi Dan I would use a 5w-40 synthetic. http://www.opieoils.co.uk/c-656-5w-40.aspx Out of those, the best ones are the Fuchs/Silkolene Pro S, Millers CFS/CFS NT+, Motul Sport/300V, Red Line and Gulf Competition. The Motul 8100 X-Cess, Millers XF Longlife, Castrol Edge/Magnatec, Fuchs GT1 XTL/Supersyn, Shell Helix and Mobil Super 3000 are good, cheaper alternatives. Cheers Tim

Very, very good :)

Hi I would use a 10w-40 http://www.opieoils.co.uk/c-657-10w-40.aspx The best ones are the Gulf Competition, Motul 300V, Fuchs Pro R, Red Line and Millers CFS. As a cheaper alternative the Fuchs Syn MC, Gulf Tec Plus, Valvoline Durablend/Maxlife, Castrol Magnatec, Shell HX7, Motul 6100 and Millers CSS/EE/Trident are good choices. Cheers Tim

Thanks for the order. The Motul Sport is a good oil, it's basically the same as the X-Cess, but with an ester content, so it's an upgrade. Cheers Tim

Hi Dan Is it standard or modified? Road or track use? Cheers Tim

Hi It's the way the look up works, it only offers K&N or Mahle at the moment. Filters are quite straightforward really, don't use rubbish. I (and most of the other guys here) us Mahle, plus we sell something like 200000 of their filters a year, with no quality issues at all. Bosch have always been pretty good, so we do those as well now. K&N are decent filters, but they also have filters for vehicles that the other companies don't list. The OEM filters that we have are just because one of our suppliers sells them and customers want them, but I don't really see the point in them. They are just a filter made by a filter company, then re-badged as OEM. Cheers Tim

HI Yes, still here, so if anyone needs advice, give me a shout. Cheers Tim