I would only use a fully synthetic (as mentioned try-ester based) 5w30 or 5w40 engine oil. Nothing else will do...Aragorn, what would you personally reccomend for a 2.8 V6 normally aspirated engine? 5w/30 or a 10w/40 fully/semi? Many Thanks.
Guy:
Thats really not particularly useful. Your thing recommends 10w40 semi synth oil for an S4, which i'm sure your well aware should be running on a high quality fully synthetic (and preferably ester based) oil, given that its a twin turbocharged V6 motor, more often than not tuned too...
It also suggests the same oil for the 1.8T motors which again, given the high rate of engine failures due to sludging should really be running a good quality synthetic oil.
No mate, i'm not an oilman but i've ran plenty cars(specially diesels) on 5w30 Castrol EDGE and never had problems and the engines are soo clean inside with nearly no wear inside...Take a 1.8T wich was ran on 10w40 and you will see the difference...all gunk inside wich blocks the oil pick-up ! Even high milleage engines(200k +) were still good as new inside !! Unless you race the engine or its higly modified, i would not dismiss 5w30 Castrol EDGE fully syn. oil...it's 507 spec so good for ALL modern engines either petrol or diesel.adam, are you oil man?
i suspect if you ran an S4 on 15w40 semi for 100k on the vag service intervals it'd be well and truly knackered...
No mate, i'm not an oilman but i've ran plenty cars(specially diesels) on 5w30 Castrol EDGE and never had problems and the engines are soo clean inside with nearly no wear inside...Take a 1.8T wich was ran on 10w40 and you will see the difference...all gunk inside wich blocks the oil pick-up ! Even high milleage engines(200k +) were still good as new inside !! Unless you race the engine or its higly modified, i would not dismiss 5w30 Castrol EDGE fully syn. oil...it's 507 spec so good for ALL modern engines either petrol or diesel.
personally i think the 20k interval is the dodgiest part. i felt really guilty leaving the oil in my golf once for 9k. 20k intervals have to be for tight/lazy/fleet peopleThe most dodgy part of that recommendation, is its only "acceptable" if the motor is on normal servicing. If its on AVS / Longlife servicing with 20k between oil changes, then it shouldnt be on a semi-synth, and the majority of S4's and infact most audis from around 2000 onwards will be on AVS.
my thoughts exactlySDM: I understand what your saying, and i've been in the same situation myself, but this is when people need to learn to DIY.
A Gallon of oil and a filter is 20quid, a new engine is £2000+. Even places like kwikfit do oilchanges for much cheapness.
I can understand that throwing £100-200 at a dealer might be out of someones reach if cash is tight, but if you cant throw £20's worth of oil and filter at the car every 5-10k, then you have to question how the rest of the vehicle is maintained and how safe it is to actually be on the road....