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Originally Posted by trooper113
Well.....there I go being wrong. I recalled Syn 3 being discussed as a semi-syn. Perhaps it's a hydrocracked syn.....not that it matters at all. 
T113 |
It looks like there is a difference in allowed terminology between US and Europe. Here, an oil described as 'synthetic' has to be 'full synthetic', is described as such, and is definitely not compatible with dino. A 'semi-synthetic' has a mix of synthetic and dino and either type can be added as a top up, though it's not recommended to be too cavalier with mixing.
Rocky Mountain HD has a FAQ on Syn3 here:
http://www.rmh-d.com/parts/syn3_faq.php
From this couple quotes, I'm guessing Syn3 would have to be called a 'semi-synthetic' in Europe:
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Q. If I'm on the road and realize I need to add a quart of engine oil, and SYN3 is not available, what should I use?
A. If SYN3 is not available and addition of motor oil is required, the first choice would be to add HD360 SAE 20W50 to the SYN3 for engine lubrication. Although HD360 oil is compatible with SYN3, we suggest the mixture of the fluids be changed as soon as possible. If HD360 is not available, the second choice would be to add an acceptable diesel engine oil as listed in the Owner's Manual, and, again, we suggest that the mixture of fluids be changed as soon as possible. Do not add diesel engine oil to the primary chain case or transmission.
Q. Can a quart of oil be added to the primary chain case or transmission if SYN3 is not available?
A. If SYN3 is not available and addition of lubricant to the primary chain case (Evolution 1340 and Twin Cam 88 models) is required, the first choice would be to add H-D Primary Chain Case Lubricant (part #99887-84). Although H-D Primary Chain Case Lubricant is compatible with SYN3, we suggest the mixture of the fluids be changed as soon as possible.
If SYN3 is not available and addition of lubricant to the primary chain case and transmission for Evolution XL and Buell models is required, the first choice would be to add H-D Sport-Trans Fluid (part #99896-88). Although H-D Sport-Trans Fluid is compatible with SYN3, we suggest the mixture of the fluids be changed as soon as possible.
If SYN3 is not available and addition of lubricant to the transmission (Evolution 1340 and Twin Cam 88 models) is required, do not add H-D Semi-Synthetic Transmission Lubricant as the two lubricants are not compatible.
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Effectively, they seem to be saying if you must top up Syn3, then use dino.
I'm still confused
Pete
