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Open Roads Forum  >  Class A Motorhomes

 > Synthetic oil in an Onan QD 7500

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Gator48

Branford

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Posted: 05/01/12 12:50pm Link  |  Print  |  Notify Moderator

I just did an oil change on my generator using spec oil, and after the fact started to wonder if Synthetic would have been better.

Any input?

Artum Snowbird

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Posted: 05/01/12 12:54pm Link  |  Print  |  Notify Moderator

I use synthetic blend in all my motors, lawn mower, pressure washer, generators... I like that it's better and most of those devices don't have oil filters.


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Posted: 05/01/12 12:56pm Link  |  Print  |  Notify Moderator

Since the gen takes such a small amount I use Royal Purple.


2012 Thor ACE 29.1


Hawkeye10

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Posted: 05/01/12 01:13pm Link  |  Print  |  Notify Moderator

Just changed my oil and filter today on my Onan. I use Mobil 1 synthetic on the generator and the coach motor. I think it is worht the expense for the added protection.

The Texan

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Posted: 05/01/12 01:16pm Link  |  Print  |  Notify Moderator

Ours has had nothing but synthetic since the initial oil change when it was new. Just had it serviced at Speedco with Rotella T-6.


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wolfe10

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Posted: 05/01/12 01:22pm Link  |  Print  |  Notify Moderator

Hawkeye10 wrote:

Just changed my oil and filter today on my Onan. I use Mobil 1 synthetic on the generator and the coach motor. I think it is worht the expense for the added protection.


If a gasoline or propane generator that's great (if the proper viscosity).

But, if a diesel, read carefully on the bottle/can to verify that it IS for diesels/meets the mil specs of you diesel.

The two oils are not necessarily the same!


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doubleG

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Posted: 05/01/12 01:49pm Link  |  Print  |  Notify Moderator

I use what it came with and I think it was Mobil Blue Syn. Onan 10KW

zman-az

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Posted: 05/01/12 02:29pm Link  |  Print  |  Notify Moderator

mci7 wrote:

Recommended lube oil is a good quality 15W-40 Like Shell Rotella, or any other quality oil. If you feel better using the synthetic, by all means do what makes you happy, it only costs a few bucks more. For me, it is a total waste of money, but everyone has an opinion for sure, why I recommend, Do what makes you the happiest.
Dave


On the same line here. I know of alot of engines with well over 200,000 miles on regular oil. Changing the oil and airfilter on a timely basis is more important.

I do like sythetic in tranny's and as a mix in my 2 stroke stuff. Only because you rarely change tranny fluid and with the 2 stroke you actually burn the oil and its cheap.

As far as your generator, it may be worth it as it does not take much oil but I would just wait until your next oil change to put it in.





mci7

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Posted: 05/01/12 01:57pm Link  |  Print  |  Notify Moderator

Recommended lube oil is a good quality 15W-40 Like Shell Rotella, or any other quality oil. If you feel better using the synthetic, by all means do what makes you happy, it only costs a few bucks more. For me, it is a total waste of money, but everyone has an opinion for sure, why I recommend, Do what makes you the happiest.
Dave

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