oil should always be changed every 5000kms(10 000 absolute max) as it wiil get too much fuel contamination, and hence more friction than needed.
i usually take the oil cap off after ive removed the sump plug as it usually helps the oil come out a bit quicker.
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Originally Posted by smoke_rubber
No offence, but who in their right mind that knows a bit about cars would buy cheap shit oil?
I know i wouldn't, always magnatec or some castrol product.
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i know an excellent engine rebuilder he reckons never use castrol oil mainly their cheap stuff(gtx) incl. magnatec because hes had a rebuilt motor serviced on castrol every 5000kms after bout 200 000 ks (i think), the motor wasnt running the best so out it came and he couldnt beleive how much sludge was in the motor mainly under the rocker cover....
he always uses penrite semi-synthetic stuff- hpr 30 (15w/60) or for new hi-qual cars hpr 15 (5w/40 i think)
if u look at the api rating. eg. api SL/CH the letter after the S is the oil "performance" rating, i think L is the highest. most penzoil, semi synthetic and synthetic stuff has the SL rating. if i had a new hi-po motor i would prob use full synthetic for the best protection. otherwise semi synthetic.
Also the thinner(ie. weight) the oil is the less horsepower that is used to drive the oil pump, only recommended if you have a fairly new motor and rev your engine around 6k as you wont see much difference below that. also wouldnt recomended it for old motors. there isnt a big difference in power but it is easy power that is there if your motor wont mind it.