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| Oil Question https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=1351 |
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| Author: | Finisher [ Wed Oct 10, 2007 11:45 am ] |
| Post subject: | Oil Question |
I have a 1988 Horizon 200, OMC 5.0L. The owner's manual suggests SAE 30 single viscosity oil for the engine. That's easy enough to find, but I'm wondering if I wouldn't be better off using a multi viscosity synthetic for better oil flow at start up?? I don't run in cold temps, but still have a doubt about the pumpability of an SAE 30 in a cold engine. Any thoughts?? Thanks |
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| Author: | Fred 248 Vista [ Wed Oct 10, 2007 12:28 pm ] |
| Post subject: | Re: Oil Question |
My Vista has a 5.7L Volvo-penta engine that also calls for SAE 30 weight oil. I'm no expert however right after I purchased my boat in 2000 I spoke to Volvo about this same question. They recommended in no uncertain terms to stick with the 30 weight oil and stay away from multi viscosity oil. Since they are "experts" I decided to take the advice. |
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| Author: | Finisher [ Wed Oct 10, 2007 2:48 pm ] |
| Post subject: | Re: Oil Question |
Thanks Fred, I think I'll also follow that advice. A conventional SAE 30 is MUCH cheaper than Mobile 1 Multi-Visc Synthetic, so that's a bonus too. Thanks for your reply. |
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| Author: | 230 Mike [ Thu Oct 11, 2007 5:06 pm ] |
| Post subject: | Re: Oil Question |
The thinking is that multi-vis oils get their mult-vis properties from the additive packages added to the base oil, and these additives don't hold up well in marine use (high rpm's all the time, etc.). You could compromise and use Volvo's current spec, which is straight 30 synthetic. Unfortunately Volvo is about the only source for it, and they want about $10/quart for it. However, I figure it's a once-per-year expense. |
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| Author: | atcdoug [ Thu Oct 11, 2007 5:55 pm ] |
| Post subject: | Re: Oil Question |
You can get 100% synthetic SAE30 from Royal Purple. You can get it online. I bought mine on Ebay. I only have 70hrs on my boat so I can't say how good or bad it is. I did put it in my car and noticed a big difference. The engine seemed to run much smoother than it did with Mobile One and costs about the same. Doug |
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| Author: | LouC [ Sun Oct 14, 2007 1:31 pm ] |
| Post subject: | Re: Oil Question |
I have a similar boat just with the 4.3 V-6, I have always used Chevron Delo 400 30 weight. So far I've had good results with it, the oil pressure holds up well with a hot engine, and I have not had starting troubles with it at temps as low as 45 degrees (a few times when I winterized!) I would probably not use a syn oil in an original engine of that age, due to the possiblilty of leaks. The other option is the Mercruiser 25-40 oil, it's not a true multi vis (no VI improvers) but a combination of 25 and 40 weights oil, and is designed specifically for marine engines. |
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| Author: | Finisher [ Sun Oct 14, 2007 7:15 pm ] |
| Post subject: | Re: Oil Question |
Bought the conventional SAE 30 weight oil today. I too think putting synthetic in an engine this old may be asking for trouble. I think the 30 will be fine, my research hasn't raised any doubts to the contrary. Thanks all, interesting discussion |
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| Author: | jvalich [ Sun Oct 14, 2007 7:54 pm ] |
| Post subject: | Re: Oil Question |
I follow the old saying..."if it ain't broke , don't fix it" |
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| Author: | njlarry609 [ Thu Oct 18, 2007 9:53 pm ] |
| Post subject: | Re: Oil Question |
How come a multi wt works in a Merc but not a volvo if the blocks are the same? |
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| Author: | LouC [ Fri Oct 19, 2007 6:06 am ] |
| Post subject: | Re: Oil Question |
A mystery only known to the engine marinizers! Supposedly the Merc oil is not a true multivis but a combination of 2 weights 25+40. The diesel rated conventional oils seem to work well in gas inboards. You can also get the Pennzoil straight weight marine oil at West Marine. |
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| Author: | dgdake [ Wed Oct 24, 2007 1:01 pm ] |
| Post subject: | Re: Oil Question |
When I look at the Volvo Penta manual for the 5.0 available on line http://www.volvo.com/volvopenta/global/ ... rs_manual/ it says 30W, 15W50, and 20W50, are all OK. I have used all three over the years and all seemed to work fine. Having said that, I mostly use Volvo 30 weight synthetic in my current engine. Also I do not store my boat in the water and I am on fresh water only. |
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