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I have a nearly full 20L tub of GM's finest 10/40 Semi in the garage, that was planned for the 3.2, this ok to go into 1.4 Turbo petrol lump?
Probably not, the turbo needs a pretty high spec oil, which version of 1.4 is it? (year and bhp is a good guide)
Ok, so no, should be: SAE 5W-30 or SAE 5W-40.
That's only half the story - what spec does it want? (i.e. ACEA A5, API spec, brand specific spec etc) That's just as (if not more) important than the viscosity..
Does it matter that much in petrol? Thought yes for diesel with DPF etc.
Depends on the petrol but yes, it can do - direct injection (quite common, now) requires specific oils, for example, which deposit less carbon in the intake (since there is no fuel washing the intake tract anymore, they tend to coke up very quickly)..
Ok, so no, should be: SAE 5W-30 or SAE 5W-40.
That's only half the story - what spec does it want? (i.e. ACEA A5, API spec, brand specific spec etc) That's just as (if not more) important than the viscosity..
I have a nearly full 20L tub of GM's finest 10/40 Semi in the garage, that was planned for the 3.2, this ok to go into 1.4 Turbo petrol lump?
Await expert input, but I wouldn't run any turbo car on semi-synth. For example a lot of GM era saabs suffered sludge build up which was, in part due to oil breaking down when it passed hot spots in the engine (particularly around the turbo). Its notable that the Aero models suffered less with this, due to it being mandated that they used fully synthetic oil.
I'd suspect not, what spec does the book say?
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