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Marine oil in a passenger car engine #5397692 04/08/20 06:50 PM
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Thunderbolt Offline OP
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So, I know this may be an odd question and lots of people will probably ask "why", but I'm going to ask anyway.

In my 1995 Subaru Impreza with the 2.2L and 185,000 miles, I've been using 10W-30 conventional oil at 5k OCI's.

I'm working on getting the boat ready for the season and will be running to the marine store to get 25W-40 oil for the boat. They're advertising they have a well known brand of marine oil on sale in the 10W-30 grade. Other than the FW-C rating, is there anything wrong with using the Quicksilver 10W-30 in my Subaru or should I just stick with my conventional SN rated oil? The sale price is about $5 less for the Quicksilver 5-qt than a 5-qt jug of the Pennzoil I usually use. Thanks for the input!


2013 Ford F-150 SuperCrew, 5.0
1995 Subaru Impreza wagon, 2.2
Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397707 04/08/20 07:06 PM
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skyactiv Offline
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Use whatever floats your boat.


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Me: 18' Elantra Sport 6 speed manual
The rude guy that points out reality


Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397709 04/08/20 07:11 PM
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TheLawnRanger Online Content
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This


2011 Impala
2012 Colorado
Oil: 5w30 synthetic
Filters: Wix 51522 for both
Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397734 04/08/20 07:25 PM
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super20dan Offline
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I guarantee there is no difference in marine 4 cycle and car oil of that grade


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Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397735 04/08/20 07:26 PM
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walterjay Offline
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You're out of warranty so why not.

Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397740 04/08/20 07:30 PM
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atikovi Offline
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Do Subarus float?

Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397746 04/08/20 07:37 PM
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55hambone Offline
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You might want to check the Quicksilver oil again. I've seen it in quarts and gallons-no 5 quart jug. Per quart I'll bet the Pennzoil is cheaper.

Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397750 04/08/20 07:41 PM
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Gokhan Offline
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FC-W and FC-W Catalyst Compatible® specs are not nearly as strict as any PCMO or HDEO specs. They mainly test for things like rust etc. that apply for marine engines only. There aren't any engine-wear, engine-deposits, etc., tests.

The full FC-W specification is posted here.

FC-W four-stroke oil certification program

So, no, do not use these oils in your car or truck unless they carry additional specs.


2020 Toyota Prius Prime XLE plug-in hybrid, 2ZR-FXE engine, ~ 65 mpg on regular gasoline, ~ 5,000 mi
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Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397774 04/08/20 08:13 PM
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Seeing how you can get 5qt jugs of passenger car Supertech full syn for like $15 or 5 quart jugs of Chevron Supreme conventional 10w30 for $12.50 from walmart, I don't get the point of putting marine oil that's not rated for a passenger car in your car.

Re: Marine oil in a passenger car engine [Re: blufeb95] #5397811 04/08/20 08:43 PM
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Thunderbolt Offline OP
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Originally Posted by blufeb95
Seeing how you can get 5qt jugs of passenger car Supertech full syn for like $15 or 5 quart jugs of Chevron Supreme conventional 10w30 for $12.50 from walmart, I don't get the point of putting marine oil that's not rated for a passenger car in your car.

I wasn't sure if I could use it or not. That's why I'm asking. I now know it's not rated for passenger cars.

Consensus seems to be that it's not a good idea, so I'll just stick to what's worked for the 13 years I've had the car. Thanks to everyone for your input!


2013 Ford F-150 SuperCrew, 5.0
1995 Subaru Impreza wagon, 2.2
Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397858 04/08/20 09:41 PM
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oilboy123 Online Content
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Very bad to use the non marine rated oil in boat engines because of extra corrosion taking place inside the engine. Of course climate, and whether the boat is around salt water affects the chance of corrosion. We see engines come in that have pitted cams that had automotive oil inside the engine.


“Loyalty to country ALWAYS. Loyalty to government, when it deserves it.”
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Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397898 04/08/20 10:32 PM
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David2431 Offline
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I've always thought the difference between marine and automobile oils besides corrosion additives is that marine oils are blended with beefier anti-foam additives.

Marine engines typically operate at higher rpms for extended periods of time compared to automobile engines so they require additional anti-foam additives.

Re: Marine oil in a passenger car engine [Re: oilboy123] #5397905 04/08/20 10:35 PM
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4WD Offline
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Originally Posted by oilboy123
Very bad to use the non marine rated oil in boat engines because of extra corrosion taking place inside the engine. Of course climate, and whether the boat is around salt water affects the chance of corrosion. We see engines come in that have pitted cams that had automotive oil inside the engine.


Personally I stick with NMMA FC-W oil for my outboard … but you’ll get treated like a fool on this site for not running HDEO instead. You think this pitting happens with something like Delo or Rotella ?

There was a marine mechanic in south Texas who did a demo with twin motors and the PCMO side was foaming whereas the NMMA side did not.

Re: Marine oil in a passenger car engine [Re: skyactiv] #5397980 04/09/20 01:50 AM
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Lolvoguy Online Shocked
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Originally Posted by skyactiv
Use whatever floats your boat.

What you did there....I see it.
thumbsup


06 Lexus IS350- Wife
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Re: Marine oil in a passenger car engine [Re: Thunderbolt] #5397996 04/09/20 03:52 AM
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FordCapriDriver Offline
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Marine oil will turn it into a Scubaru.


1975 Ford Capri II Ghia 3000 V6 - 315k, Repsol Elite Super 20W-50
1988 Ford Escort XR3i Cabrio - 110k, Valvoline Maxlife 10W-40

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