pedrosixfour Posted January 12, 2012 Share Posted January 12, 2012 Hi all. I want to do a quick service on my sister's 06 Hyundai Coupe 1.6 at the weekend. I went to my local motor factor's to pick up filters, plugs and 5 litres of semi synthetic oil for a petrol engine, as I have done on a regular basis since she bought the car new. I've always used Castrol Magnatec 10w40 oil in it with no complaints and I saw no reason to change today. Except that now Castrol doesn't seem to be available in anything other than a type which the manufacturer claims is suitable for both petrol and diesel engines. I tried two other motor factors and got the same pitch from the staff "It'll be fine, it says so on the sticker". My knowledge of oils and their properties is limited to say the least but I was always under the impression that oil suitable for a diesel had detergent in it and to use such oil in a petrol engine (which has always been filled with an oil for petrol engines only) would lead to engine damage. From what I've gathered if the engine had been filled with petrol/diesel engine oil from the first service there would be no problem as the cleaning properties of the oil would have kept the engine cleaner from the start. But to introduce such an oil now would flush carbon deposits into areas where it could do serious harm. Am I misinformed? I've no problem switching to a different brand if it is clearly suitable. Thank you for any guidance. Regards, Damien. Quote Link to comment Share on other sites More sharing options...
Ian C Posted January 17, 2012 Share Posted January 17, 2012 I know the Ford engines all use the same oil, be it a Focus 1.6 petrol or a Mondeo 2.0l Diesel. I guess things have progressed to this point, which makes life easier for us and the manufacturers. Quote Link to comment Share on other sites More sharing options...
pedrosixfour Posted January 18, 2012 Author Share Posted January 18, 2012 Thanks for your input Ian. I was a little wide of the mark myself when I claimed that the oil I had used previously had been for petrol engines only. I thought ACEA A3/B3 was a petrol spec as the label on the can never claimed it for use in a diesel engine, unlike the ACEA A3/B4 which is suitable for both petrol & diesel. When I checked the standard's website A3/B4 is suitable for use in place of A3/B3 which is a dual engine grade. That would mean that the oil I had used previously had all the properties of this new oil, including its suitability for diesel engines. So as far as I can tell any oil I put in the engine before had as much detergent in it as this new stuff so all is well. Quote Link to comment Share on other sites More sharing options...
Dnk Posted January 18, 2012 Share Posted January 18, 2012 My Landcruiser is now on a dual petrol/diesel engine oil and all appears to be fine Quote Link to comment Share on other sites More sharing options...
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