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Wrong Oil

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Segilla | 22:40 Fri 30th Aug 2013 | Cars
13 Answers
I've accidentally filled my petrol engine with synthetic oil for a diesel engine. Otherwise it's the correct grade. Must I drain and refill?



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Nope......If you look at the pack, it should have a rating, the diesel starting with a Cxx and then /Sx - the C is the rating for compression engines, the S for spark ignition....
which oil is it....?
A) should your engine have synthetic oil?
B) what should your cars oil be?
C) what oil have you put in?
So what we need is the answer to the make of car and year - and the oil type - full title please, and if you can give us the grade like 5W50, that would help us determine the answers....Zac is right in an implication that most cars, unless very high end, are perfectly happy on a semi-syn.
Question Author
Car is a Mitsubishi Mirage, 2013.
Oil recommended includes 5W40
Engine was topped up from min mark on dipstick to max with Halfords Fully synthetic diesel oil 5W/40 made to standard ACEA-A3, B4 and API-SM, CF

Please don't ask how it happened :-)

As its so new, I would recommend phoning a main dealer as anything which goes wrong could invalidate the warranty. As its the same grade you should be ok, but best to check. The service dept should be open on a Sat morning.
Question Author
Perhaps I should have repeated that the car has a petrol engine
We gleaned that from your OP.
You should use the correct oil for your car not a cheap halfords one, if your car is still under warranty you could already have lost the rest of the warranty as servicing should be done at a vat registered garage where they would have signed the service book!

Look here for the correct oil..............
OP says he topped up from min to max - not a whole service!
...and the "cheap" Halfords oil isn't that cheap - and conforms to all relevant standards....
looking at the OP's information, the car has not had an oil change, but a top up from min to max on the dipstick. I am guessing this will involve no more than about one litre of oil, so only about 20% of the total oil volume will be "incorrect"
It should be all right with the SM specification......the warranty point is true but then if they do not offer to replace the oil as part of the service they can not insist on exclusivity, only reference it.

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