HDEO in a Twin Spark? - Alfa Romeo Forum
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HDEO in a Twin Spark?

Hello all!

What do you think about using HDEO (Heavy Duty Engine Oil) for a Twin Spark?

Anybody tried it before?
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Truck oil???? If you want to screw the engine ...

10W40 or 10W60 ....
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Well, some of these are multi fleet and meet the specs for gas engines - SAE and API.

I am after the improved cleaning abilities
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HDEO with a petrol rating in the right viscosity is OK to use. I would use something E9 rated also meeting ACEA A3 or API SL/SM/SN so it wont totally destroy your cat and O2 sensor if it happens to burn a lot of oil.
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Thanks Steve!

The oil i am looking at is a local cheap brew that meets very high specs of gas and heavy duty diesel engines - including turbocharged. However, it is a dino and I wonder if it will be OK for short OCI's of 5-7K Km. I know synths are better but then, a regular 10w40 semi can have over 60% group II. So what is the real difference?

Will I risk my variator, cams and big ends?
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What the oil is made of is not as important as the overall performance of the oil. 10w40 in europe tends to be semi synthetic as it needs a little synthetic to meet the requirements of ACEA A3. 15w40 may not need any synthetic to meet the same requirements. The trade off is of course the cold pumping viscosity. I assume you are looking at a 15w40. 15w40 may not really be the best choice, but in a mild climate it will not cause any problems. It definately wont do any damage to the bearings and cams etc and HDEO generally holds up better so oil change intervals dont need to be shorter, they could even be longer. You can of course get 10w40 and 5w40 HDEO too.
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For a Dyno oil i would change at around 3000kms but as long as the viscocity is 10w40 it will be fine. There are not many Dyno oils at 10w 40 most are 15w40 or 20w50 and above.
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A lot of mineral 15w40 oils with A3 or SN approvals have some synthetic GIII in them now so they are technically semi synthetic. Mineral/semi synthetic/synthetic claims are almost just all marketing now. Some blends dont claim "synthetic" on these oils because there is a market out there specifically looking for oil that is not synthetic because they have a preconception that synthetic is bad or causes leaks or wears out cams etc.
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