Trojan Boat Forum

9rock · Post by **9rock** » Mon Apr 04, 2011 3:19 pm

Doing my first oil change on my 360s what oil should I use reg or synthetic or blend

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alexander38 · Post by **alexander38** » Mon Apr 04, 2011 5:28 pm

Your going to get 30 answers. Mine is 15 40 wolfheads syn-dino blend. Useit in my FedEx trucks. Works fine in my 454' s.

prowlersfish · Post by **prowlersfish** » Mon Apr 04, 2011 6:43 pm

15w-40 dino ( non synthetic ) would be my choice and has been for years gas or diesel boats . I use Rotella right now but would be just as happy with penz , valvoline blue or most any major brand. In fact its time to buy about 8-10 cases again

Synthetic or a blend ?IMO save your money , But if it makes you happy go for it . it won't hurt other buying it .

alexander38 · Post by **alexander38** » Mon Apr 04, 2011 7:02 pm

Tax right-off

prowlersfish · Post by **prowlersfish** » Mon Apr 04, 2011 7:09 pm

alexander38 wrote:Tax right-off

And your only using a blend ?

9rock · Post by **9rock** » Mon Apr 04, 2011 7:42 pm

so 15-40 is the weight i should be using

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prowlersfish · Post by **prowlersfish** » Mon Apr 04, 2011 7:59 pm

Thats what Many OEM are recommending now , and I have been using it in my last 5 boats The only inboard I would not use it in is a Detroit Diesel ( 2 cycle ) total different animal

Other choices are 30w or in real hot weather 40w ( not 10w-40) 15w-40 was not around when your engine was new but it is a good choice . It will cover any temp you will run into in this area striper fishing in Jan or Feb or running down the bay in august heat . Year round it will work

Its what I would use no question

rossjo · Post by **rossjo** » Mon Apr 04, 2011 8:17 pm

synthetic if you've go the money, but I use Rotella-T 15w40 in my diesels and Mercruiser 15W40 in my 454.

captainmaniac · Post by **captainmaniac** » Mon Apr 04, 2011 11:01 pm

For what it's worth, I use straight 40 weight non synthetic in my '79 with Chrysler 360's.

My engines (gas) are 30+ years old, built with 30+ year old tooling and have over 1600hrs of wear and tear on them. With straight 30 weight, I notice more oil lean and/or burn than with the 40 weight.

Synthetic oils and multigrades are much newer technology. Newer engines are likely finer tooled, closer tolerances, and may have even been designed with multi-weight or synthetic oils in mind.

For old school engines, I am sticking with old school oil technology.

kevinz · Post by **kevinz** » Tue Apr 05, 2011 7:39 am

Delo 400 straight 40w for my Crusader 454s with 575 hrs.

vabeach1234 · Post by **vabeach1234** » Tue Apr 05, 2011 8:40 am

I use Mobil 1 10W-30 full synthetic in my LM318.

The manual "Chrysler Marine Engine V-8 Marine Engine Operating Manual" states the following:
"SAE 30 should be used when the anticipated atmospheric temperature will be above 32 degrees, SAE 20W in temperatures below 32 degrees. SAE 10W-30 oils may be used to ambient tempertures as low as +10 degrees."

"Non-detergent or staight mineral oil should never be used"

I'm not staying what to use, I'm just stating what the manual I have for my engine states.

pk · Post by pk » Tue Apr 05, 2011 9:36 am

Pennzoil 15W- 40 Best there is!

Heefus · Post by **Heefus** » Tue Apr 05, 2011 10:22 am

I am running Valvoline 20W-50 in my 318's.

The PO has been running it, on both the original and the new blocks, since 1984. I am not gonna mess with the Mojo.

Muskokan345 · Post by **Muskokan345** » Tue Apr 05, 2011 4:04 pm

Like others here, I`ve always been under the impreassion that a single grade oil is the way to go. Read somewhere once that multi-grades contain detergent which is bad for marine engines, never really understood that. Maybe someone higher up the payscale could explain it to me. Plus, I`ve always owned boats 20 to 30 years old, maybe that has something to do with it.

pk · Post by pk » Tue Apr 05, 2011 5:26 pm

In my aircraft I allways use Shell 15W-40. A multigrade oil. I donÂ´t see why we canÂ´t use the same system in marine engines. A aircraft engine is made for working under constant RPM, the same way the marine engine.