teg is blowing white/grey smoke at very high revs. i know this is characteristic for some cars at crossovers so should i be worried if my engine oil and radiator coolant shows no signs of problems and is running smooth? not related but is 5w40 sae bp oil safe for my car? it aint castrol edge or feo but had a bottle just wondering if i should use it? currently running like 30w60(high) or something.