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[vauxsull]

5/30 and 5/40 oil in my wife's tigra?

[Nick W]

If either grade is OK, then mixing them won't matter. Unless you're trying for 10/70!

[vauxsull]

Both are suitable for this car and I have 2.5 litres of each so it'll be a 50/50 mix of both.. Not understanding oil spec ect I wasn't sure it was ok to mix two together..

[05omegav6]

It's not your car, so it will be fine

[vauxsull]

Haha buts its my wife's low mileage car... Don't want to screw things up with it as I'll have to put it right.

[Diamond Black Geezer]

What's the general mechanic's rule? regular oil changes on poorer/ok oil every few thou are better than longer, irregular oil changes with even the finest grade. I'd say fine. But, of course ideally the correct stuff.

[zirk]

wife's tigra?

While your underneath check all the Engine Mount Bolts are nice and tight on them. 

[vauxsull]

Its an 05 plate 1.8 sport and just coming up to 40k... so what else should i be looking for with this car??

[05omegav6]

Nice engine and a doddle to service 

[vauxsull]

been a good motor in the two years shes had it.. basically a corsa inside th its in the ough but it can shift abit being the 1.8..... unfortunatly its in the girly pastel blue colour which does nothing for my street credability when i use it

[vauxsull]

i cant make head nor tail of half of what i typed there.... not used to this laptop..... bugger

[Broomies Mate]

Viscosity is not an issue.

Provided both oils are of the same 'genes', Synthetic, Semi-Synthetic, Mineral etc, then you are ok.

To clarify, if both are Synthetic, then go for it.  If one is Synthetic and the other is Mineral, then I'd err on the side of caution.

Oil is dirt cheap..... go and buy some you tight git! 

[vauxsull]

Both oils are full synthetic.... I will have to buy more when its due on her car again...