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Old 06-30-2013, 10:02 AM
Pierre2013 Pierre2013 is offline
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Join Date: Jun 2013
Posts: 1,056
How old is your oil???

Two days ago I was in a store selling Exmark and Hustler ZTR. Since it was my first time in that particular store, I looked around to see what they were selling on the shelves. I was shocked when I saw that some of the various brands of engine oil had an API as old as SH. SH and earlier ones are considered obsolete.

The current and most up-to-date oil you can buy as an API of SN. SJ, SL and SM are still ok to use, but you are not doing yourself and your engines any favor if you use anything less than SJ.

So you might want to make sure that you are using an oil with an up-to-date API irrespective of the brand and the type of oil used.

Btw, in my new mower I'm using (conventional oil) Tutela 10w-30 with an API of SN.
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Old 06-30-2013, 12:25 PM
Keith's Avatar
Keith Keith is offline
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Join Date: Dec 1999
Location: Central Florida
Posts: 3,973
You can walk into stores down here and find 'SA' oil. Popular in convenience stores and places that have a cheaper line of oil. Fine for your 1928 engine. Not so red hot for your 94.
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Old 06-30-2013, 09:48 PM
Pierre2013 Pierre2013 is offline
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Join Date: Jun 2013
Posts: 1,056
I found a chart that speaks volume about the API rating of engine oil.
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