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#4761388 - 05/18/18 08:09 PM Amsoil in a 5.7 (~1000hours) or still use T5 ?
Yannick Offline


Registered: 09/16/13
Posts: 94
Loc: Montreal,Quebec,Canada
Hello,
I have a Mercruiser 5.7 with around 1000hours in the heart, I always put Rotella T5 15w40, but now the API SM is over.

What do you think switching at 1000hours on full Synthetic AMSOIL 15w40 ? AM I gonna expect some leak problem ?
Should I keep going with T5 even without the API SM ?

thanks

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#4761394 - 05/18/18 08:19 PM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
tomcat27 Offline


Registered: 06/25/09
Posts: 3579
Loc: Chicago, IL
Should be fine. If it leaks, switch back.i run something different every year in mine.
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#4761431 - 05/18/18 09:21 PM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1424
Loc: Jacksonville, FL
My last UOA on my 4Runner with Rotella T4 10w30 in CK-4 spec looks pretty darn similar to the old SM spec. It's boxed and labeled as CJ-4 /SM but in the new bottle and confirmed by shell rep on here that the new bottle contains CK-4 despite the label stating CJ-4 SM. To me that says it would've also met the SM specs but the new labeling requirements force the removal of gas ratings unless the oil companies cut way down on Phosphorus and Zinc. I would continue to use the Rotella with confidence.
_________________________
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P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4761432 - 05/18/18 09:22 PM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
JLTD Offline


Registered: 12/15/17
Posts: 829
Loc: US
1000 hours is similar to 60000 miles in a car; several members have switched to synthetic at much higher mileage without issue so IMO you should be fine - and will probably see a cooler running engine and perhaps fuel savings.
_________________________
Hers: 2008 Jeep Liberty 135k, AMSOIL SS 5w30/same

His: 2015 4Runner SR5 1GR-FE 39k, AMSOIL OE 5w20/Wix

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#4761433 - 05/18/18 09:22 PM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
FlyNavyP3 Offline


Registered: 07/04/16
Posts: 1424
Loc: Jacksonville, FL
As an aside with 1,000 hours I'd consider freshening up the top end on your 350. Valve job and new valve springs. They're really ugly when they break a valve spring and end up dropping a valve.
_________________________
Luke
P-3C and P-8A Maritime Weapons and Tactics Instructor, Instructor Tactical Coordinator and Mission Commander

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#4761529 - 05/19/18 12:53 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
Dyusik Offline


Registered: 09/26/14
Posts: 2000
Loc: US-WA
The lack of API Sx means nothing, other than the fact that it does not comply with a restriction. Just keep T5 in there.
_________________________
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#4761631 - 05/19/18 05:56 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: JLTD]
demarpaint Offline


Registered: 07/03/05
Posts: 29974
Loc: NY
Originally Posted By: JLTD
1000 hours is similar to 60000 miles in a car; several members have switched to synthetic at much higher mileage without issue so IMO you should be fine - and will probably see a cooler running engine and perhaps fuel savings.


I could only dream about driving 60K miles in thousand hours. I seriously doubt I'd see 25K miles in that much time.

Back OT- switching won't be a problem.
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#4761704 - 05/19/18 07:31 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
terminaldegree Offline


Registered: 11/09/04
Posts: 425
Loc: central Georgia
As others have mentioned, not having the SM spec is meaningless for the engine youre using. Id stay the course and keep using it. Switching is also fine, but Id rather save my money on a motor with that many hours to pay for refreshing exhaust riser gaskets, water pump impellers, stern drive gaskets, and other things that are more likely to ruin your day than the brand of motor oil.

I run Delo 400 LE 15w-40 in my Nautique. Going to try and find a couple more oil changes of older stock, just so it continues to have a steady diet of the same thing its had for the last 3 oil changes. But thats honestly #30 of the things Im actually worried about with my old boat.
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#4761779 - 05/19/18 08:59 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: terminaldegree]
Linctex Offline


Registered: 12/31/16
Posts: 6186
Loc: Waco, TX
Originally Posted By: terminaldegree
Switching is also fine, but Id rather save my money on a motor with that many hours to pay for refreshing exhaust riser gaskets, water pump impellers, stern drive gaskets, and other things that are more likely to ruin your day than the brand of motor oil.


Agreed.

It's probably time to do a THOROUGH inspection of the entire drive system.
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#4787923 - 06/16/18 02:44 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Linctex]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5263
Loc: Fort Lauderdale, FL
Originally Posted By: Linctex
Originally Posted By: terminaldegree
Switching is also fine, but Id rather save my money on a motor with that many hours to pay for refreshing exhaust riser gaskets, water pump impellers, stern drive gaskets, and other things that are more likely to ruin your day than the brand of motor oil.


Agreed.

It's probably time to do a THOROUGH inspection of the entire drive system.


If he's gone 1000 hours without doing that at least once a year, he's probably already on the cusp of apocalypse.

Unless you have a catalyzed 5.7 (doubt it), your engine isn't going to care that SM was dropped from the bottle.

Where the engine is concerned, skip the top-end job. A brand new crate engine + brass freeze plugs is less than $2000. When that top-end is done, kick the whole engine, rather than tighten the top, just to start having bottom issues.

When dealing with big blocks at $5,000+ for a crate, we bother with the top end (especially since big blocks love to get a hole ate through their heads). On a 5.7? We'll do it if someone is adamant, but pretty much nobody ever has been.

Amsoil in that engine? See above. Every oil change, throw your savings by using T5 into a jar marked "crate engine". Might be surprised how much of the job your jar will cover when the time comes.

Use some nice RA or WM dollar clearance filters, and jar that savings too.
_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
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#4788560 - 06/16/18 07:57 PM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
Donald Offline


Registered: 03/21/04
Posts: 20547
Loc: Upstate NY
Rotella T 15W40.

How many hours do you put on the engine a year?
_________________________
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2015 Ford F250 w/Powerstroke
2016 Subaru Crosstrek CVT (wife's)


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#4792435 - 06/20/18 07:43 PM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: JLTD]
oilpsi2high Offline


Registered: 12/18/14
Posts: 1385
Loc: NY, USA, etc.
Originally Posted By: JLTD
1000 hours is similar to 60000 miles in a car; several members have switched to synthetic at much higher mileage without issue so IMO you should be fine - and will probably see a cooler running engine and perhaps fuel savings.


Maybe if you floor it at every takeoff and run it at 3000RPM when cruising. Boat engines live a way harder life than a car engine. I'd say 1000 hours is closer to 120-150,000 miles.

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#4800346 - 06/29/18 07:52 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Yannick]
Snagglefoot Offline


Registered: 12/31/17
Posts: 1905
Loc: SE British Columbia, Canada
Originally Posted By: Yannick
Hello,
I have a Mercruiser 5.7 with around 1000hours in the heart, I always put Rotella T5 15w40, but now the API SM is over.

What do you think switching at 1000hours on full Synthetic AMSOIL 15w40 ? AM I gonna expect some leak problem ?
Should I keep going with T5 even without the API SM ?

thanks


Just curious. Do they put cats on the inboards?

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#4806388 - 07/06/18 12:31 AM Re: Amsoil in a 5.7 (~1000hours) or still use T5 ? [Re: Snagglefoot]
DoubleWasp Offline


Registered: 05/21/12
Posts: 5263
Loc: Fort Lauderdale, FL
Originally Posted By: Snagglefoot
Originally Posted By: Yannick
Hello,
I have a Mercruiser 5.7 with around 1000hours in the heart, I always put Rotella T5 15w40, but now the API SM is over.

What do you think switching at 1000hours on full Synthetic AMSOIL 15w40 ? AM I gonna expect some leak problem ?
Should I keep going with T5 even without the API SM ?

thanks


Just curious. Do they put cats on the inboards?



They do on the most recent ones, and yes, they do use a special oil just for catalyzed engines.
_________________________
07 Lincoln Navigator M1 0w-40/FU
68 Charger R/T / Supercharged 440 VR1/DBL7349
07 Ram 3500 4x4 / Cummins 6.7 /DBL7349
17 Maserati GranTurismo Cabrio

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