10w-40 alternatives?

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cricketchaser
Posts: 11
Joined: 21 Sep 2019, 15:57

10w-40 alternatives?

Post by cricketchaser » 15 Oct 2019, 20:19

I like to use Rotella oil. My outboard calls for 10w-40, but Rotella is hard to find in that weight. What should I use as an alternative?

MrGiggles
Posts: 266
Joined: 12 Jul 2017, 21:42
Location: Springfield, MO

10w-40 alternatives?

Post by MrGiggles » 15 Oct 2019, 20:51

cricketchaser wrote:
15 Oct 2019, 20:19
I like to use Rotella oil. My outboard calls for 10w-40, but Rotella is hard to find in that weight. What should I use as an alternative?
Rotella T6 in 5W40 ought to work nicely.

turbotodd
Posts: 1167
Joined: 24 Dec 2011, 22:06
Location: 72032

10w-40 alternatives?

Post by turbotodd » 15 Oct 2019, 21:21

The additive package in automotive lubricants favors an engine that runs at 50% load or less for most of it's life.

The additive package for FC-W marine 4 stroke engines is designed around engines that run at 100% load and 100% maximum RPM most of the time.

I ain't saying rotella isn't bad stuff. Just saying that a lubricant that is designed for the engine's intended usage might be a better choice. But it's your engine and you are certainly free to lubricate it however you please.

GYPSY400
Posts: 308
Joined: 27 Apr 2012, 21:01

10w-40 alternatives?

Post by GYPSY400 » 19 Oct 2019, 12:46

turbotodd wrote:The additive package in automotive lubricants favors an engine that runs at 50% load or less for most of it's life.

The additive package for FC-W marine 4 stroke engines is designed around engines that run at 100% load and 100% maximum RPM most of the time.

I ain't saying rotella isn't bad stuff. Just saying that a lubricant that is designed for the engine's intended usage might be a better choice. But it's your engine and you are certainly free to lubricate it however you please.
I didn't know this, but I would have to agree.. there is a reason for the " marine grade " oil and it's good insurance to use the proper oil rather than an automotive substitute.

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RiverLife
Posts: 77
Joined: 30 May 2015, 15:52

10w-40 alternatives?

Post by RiverLife » 14 Nov 2019, 08:22

Rotella dropped their gas engine rating awhile ago. Who knows if they changed their formula or didn't pay to renew the gas engine rating. Their loss because a lot of folks used it in gas engines.

I quit buying it for my small engines and use another straight 30hd.

My boat gets marine lube. Motors are too expensive and the little ones work hard and break down oil quickly. I order it in the winter and stick it on a shelf.
"Fish On!"

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