What Oil To Use in My Genny Kohler 7.3

[tomschauer]

you will find many opinions here. I personally use Mobile 1 10/40 in my genny. As long as you use a quality oil and change it regularly you shouldn't have a problem.
Best wishes.

[mjk1040]

Rotella 10W30 Here!

[bud37]

Same genny...for me it will get the same as the engines...Rotella 15w40 and I agree, any good quality oil in the right grade range won't steer you far wrong....

[feeez]

+1 on the Rotella 10w30 or 15w40

[bud37]

Lots of discussions/opinions about filter choices nowadays....anyway Wix/napa gold for me....a little more but I trust them....

[Midnightsun]

15w 40 Rotella. Been using this in my previous inboards and the generator and still using the same in my diesel setup.

[Midnightsun]

Source of the post bud37 I hear ya...I wouldn't want to start a whats the best oil or oil filter thread...but I just curious mostly to hear if anyone has had a bad experience using the readily available less expensive alternative stuff. I don't put many hours on my boat (under 50 for sure) and would change oil seasonally so i'm not sure oem premium stuff is worth it.

I have used many different brands over the year including the poor Fram which has an undeserved bad reputation from long ago. Never an issue.

[tomschauer]

if you have remote oil filters that are inverted, make certain the filter you buy (no matter what brand) has an anti drain back valve or you get a second or two of dry run every time you fire it up.

[km1125]

Source of the post
I have used many different brands over the year including the poor Fram which has an undeserved bad reputation from long ago. Never an issue.

I would not say that Fram's reputation was undeserved! When I saw the teardowns of the various filters, I was HORRIFIED to see the cardboard failures inside the Frams, as that it what I had been using for years. I have not used them since and have not seen any other teardowns to see if they've made improvements or not.

[tonyiiiafl]

Mercruiser 25W40 in engines and genny