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Old 08-06-2016, 09:10 AM   #31
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Originally Posted by OldCoot View Post
Mobil 1 is the only purely synthetic oil and is available in 10-40. I use it in all internal combustion engines.
We should add Amsoil to that list. They DO offer semi synthetics as well as full synthetic oils.
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Old 08-06-2016, 09:32 AM   #32
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Originally Posted by Springerdad View Post
We should add Amsoil to that list. They DO offer semi synthetics as well as full synthetic oils.
Top 10 synthetic oils.
SO, I guess I was wrong saying Mobil 1 was the only one. I do know they were the 1st to come out with it.

Been using it exclusively since 1978.

The Best Synthetic Motor Oil (August 2016) €“ TopRateTEN
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Old 08-06-2016, 03:29 PM   #33
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Originally Posted by OldCoot View Post
Top 10 synthetic oils.
SO, I guess I was wrong saying Mobil 1 was the only one. I do know they were the 1st to come out with it.

Been using it exclusively since 1978.

The Best Synthetic Motor Oil (August 2016) €“ TopRateTEN
Oh I hate to say this. Actually, Amsoil was first. In fact, their tag line is "The first in synthetics" By a month or so. It was a marketing race. Mobil introduced their 5w30 shortly after Amsoil introduced their 10w40. And oh, did that Mobil 1 leak out of those engines of that era!
I worked in a Mobil station at that time, and my friend was an Amsoil dealer.
Amsoil was originally spelled Amzoil, but there was some trademark infringment, so they changed the spelling.
To that end, they are both great oils, and you can't go wrong using them.
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Old 08-06-2016, 08:05 PM   #34
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Originally Posted by CHICKDOE View Post
I did contact onan about this and here is their reply.


-------------------------------
We have the following response:
-------------------------------

Thank you for contacting Cummins Onan.

Even though your manual says that it is okay to use synthetic oil we do not recommend it. We have found that it gums up the cross hatches in the cylinders. You are okay to use any brand of oil as long as it is 15w40 w/detergent.

If you have any further technical questions please call us at 574-262-4611 and ask for our in house tech.

----------------------------
Sincerely,
Cummins Onan Customer Service
About the most stupid thing I have ever seen written by a customer service rep. That response is so ignorant!

How does a synthetic oil gum up cross hatches? Does the respondent even know what they are talking about?

Synthetics don't gum up anything and often run cleaner than their conventional counterparts.

If I owned an Onan, I'd use 5w40 oil which is a Group III oil anyway although the bottle says synthetic.
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