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post #11 of 16 (permalink) Old 07-17-2015, 10:55 PM
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Originally Posted by HeckflossePilot View Post
Years ago Richard Lentinello, over at Hemmings, replaced mineral oil with synthetic in a used car. The synthetic soon loosened up old carbon deposits in the nooks and crannies of the engine, clogged the oil filter, went through the filter by-pass and wiped out his bearings. If replacing mineral oil with synthetic, at the very least I would pull the cam cover and check the cleanliness of the engine, but as a rule of thumb, I wouldn't replace one with the other without a engine re-build and thorough cleaning.
This may be a concern.

carpenterman: If you believe that, then you must believe that of yourself. If oil can't be improved, then why is it you can do a 10k mile change nowadays, just increased volume?

OP asked if it's okay to use the oil. If the car is in good shape and has been well maintained, then the answer is yes.
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post #12 of 16 (permalink) Old 07-18-2015, 06:35 AM
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Quite a discussion over 5 liters of motor oil sitting in a jug in Peru. Does anyone know if it is a synthetic blend or is "Synergie+" simply a trade name?
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post #13 of 16 (permalink) Old 07-18-2015, 07:51 AM
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Oil, antifreeze/coolant and or refrigerant topics are always good for a couple of pages of posts.
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post #14 of 16 (permalink) Old 07-19-2015, 02:42 AM
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Originally Posted by ejboyd5 View Post
Quite a discussion over 5 liters of motor oil sitting in a jug in Peru. Does anyone know if it is a synthetic blend or is "Synergie+" simply a trade name?
Seems like synthetic blend:

https://www.motul.com/ca/en-US/produ...synergie-10w40
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post #15 of 16 (permalink) Old 07-21-2015, 10:24 AM Thread Starter
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Ok so I was busy these past few days with work, studying, gf and also trying to get a new job at a Mercedes dealer hehe. I see this post has reached two pages already, nice to have all this info. To clarify, I'm rebuilding the entire engine and you can say the whole car also. The engine has no oil and hasn't had any for a few years now, so there is no situation of mixing oils and I'm replacing all seals and bearings so no issue there either. I'm cleaning the engine thoroughly and all the parts of it and want to leave no carbon behind.

About the oil, I just realized it's semi-synthetic and not a 100% synthetic. The temp range it's good for the engine, also it's a gasoline engine not a diesel.

Would this oil be good or better than mineral oil? If anything at least serve it's job normally in my engine?
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post #16 of 16 (permalink) Old 07-22-2015, 10:34 AM
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I would not hesitate to use this in a fresh engine, but you may want to get more expert advice on breaking in a newly re-built engine with synthetic or synthetic blend oils. You'll also want to do an oil change within 500 miles to get the assembly lube out of there and break open and inspect the oil filter for any metal shards.
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