ACEA C3 is the requirement. It should only be used in diesel engines running on low sulphur fuel. Quantum Longlife III 5W-30 will mix with other oil but to Both are fully synthetic as far as i know, which is the big requirement for the 1.8T engine, as such i was wondering if i would benefit by using the LongLife III oil on the fixed schedule - or would this just be overcomplicating things for no real gains?

Semi-synthetic options use both synthetic and mineral oils and are a great budget option. They still have better refinement than fully natural examples meaning they're better for your engine but do not cost as much to buy as fully-synthetic models. The vRS is due an oil change soon. Last year my mechanic used Comma 5w30 "Profile" fully synth in it, its done about 6,000miles since and has been running without any issue. Quantum Long Life III has now been approved to BMW Long-life04 approvals, whilst also meeting MB specifications 229.31 and MB 229.51A premium, high-performance, low-ash engine oil for petrol and diesel engines; specially developed for long-life service intervals and vehicles with diesel particulate fillters.

As an aside i was chatting with my mechanic other day and mentioned that i was looking at VW's Quantum Oil. He responded by telling me that Quantum oil is of a poor quality and that id be better off using the Comma again - Wondered if anyone had any thoughts on this, as nearly everyone on here, UKMKIV's etc seem to unanimously recommend Quantum oil :S Prompted by a discussion here http://www.pistonheads.com/gassing/topic.asp?h=0&a... about the cost of an oil service, I was wondering what your collective opinion is with regards the choice of oil for a performance Audi. I've got a 2006 Audi S6. It's done over 100,000 miles and has been serviced according to the longlife schedule. I've only just bought it but at my next recent service I plan on switching it to annual due to the limited miles I do. I also intend on doing 6 monthly oil changes.

About oil

A premium high-performance low-ash engine oil developed for petrol and diesel engines, especially developed for long-life service intervals and vehicles with diesel particulate filters. Designed for passenger cars and light commercial vehicles. Manufactured using Quantum QFX® technology. Suitable for use in any vehicle where ACEA C3 is the requirement. Should Only be used in diesel engines running on low-sulphur fuel. However, i got to thinking that if it is intended for long life use, surely the LongLife III 5w30 must be of a higher quality and durability than the Platinum?

reduced wear and easier cold starts even at very low temperatures. Quantum Longlife III 5W-30 satisfies the requirements of vehicles fitted with exhaust gas aftertreatment devices such as SCR and DPF.No longer available in a can as pictured. The Oil is now is a cardboard cube with a inner plastic dispensable bag. gain the full benefit and to fully utilise the QFX Technology, it is recommended to change the oil completely when changing to the Quantum grade. As well as being approved for use in VW, Audi, BMW, Porsche and ŠKODA, Quantum Longlife III 5W-30 is also suitable for use in any vehicle where