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#4684968 - 03/05/18 09:20 AM Rotella T4 or T6 in SBC 350?
Pike51 Offline


Registered: 07/09/17
Posts: 88
Loc: GA
In my 1951 Chevy, we installed a rebuilt SBC 350. When we first installed the motor, there was a slight valve leak on #8. The engine came to me as a "brand new rebuild" but I've since started to learn that it may have been slightly used with less than 250 miles and the previous owner decided to go another route. Anyways, I do not know if break in oil was used correctly after the rebuild or not. So I ran conventional 10w30 for about 500 miles along with a valve adjustment and then swapped to Mobil 1 10w30. After I've been driving on this motor for around 3000 miles since this change and we seem to have finally eliminated any signs of an issue in #8 (no oil usage, no oil on spark plus, no smoke from exhaust).

I'm contemplating swapping from Mobil 1 to Rotella and wondering if T4 or T6 would be more appropriate? We are running T4 in our 56 Chevy with strongly built 355. My motor is a mild build, RPM stays less than 3000 on a regular basis. I run right at 2500 RPM on the interstate doing 75 MPH, but normally run around 2000 RPM over longer distances at around 68 MPH.

Would a better option be to continue with Mobil 1 and swap the last quart for a single quart of Rotella or possibly a high mileage oil to provide some additional protection?

I'm also considering a change from 10w30 to 15w40 or 10w40 with our higher temps in south Georgia.

Appreciate any feedback provided.
_________________________
1951 Chevy pickup 350/700r4
2013 GMC Sierra 1500 4x4

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#4684982 - 03/05/18 09:34 AM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
maxdustington Offline


Registered: 01/21/17
Posts: 635
Loc: Toronna
T4 in either variety. I would be running the 15w40 because there is no reason to run thin oil in a SBC in GA.
_________________________
03 Jetta AWP/09A 200k kms
TGMO 0W20 "Legend" & Hella Magnet Filter

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#4684990 - 03/05/18 09:43 AM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
CT8 Online   content


Registered: 10/09/14
Posts: 10956
Loc: Idaho
The 15w is better above freezing.
_________________________
"Don't let your preconceived notions get in the way of facts."
Geoff Metcalf

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#4685138 - 03/05/18 12:10 PM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2379
Loc: Balearic Islands , Spain
Get the T4 15W-40, you don't need a 5W-XX for anything in Georgia.
The T6 would not hurt anything either though, and if you prefer synthetic, run that.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4685384 - 03/05/18 04:45 PM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
slacktide_bitog Offline


Registered: 03/20/08
Posts: 6150
Loc: USA
If you can't decide between T4 or T6, try T5 smile

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#4685445 - 03/05/18 05:46 PM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Another vote for T4 15W-40 (actually, any 15W-40 HDEO, will be fine, it doesn't have to be Rotella)
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4685558 - 03/05/18 07:35 PM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
blupupher Offline


Registered: 08/27/04
Posts: 4421
Loc: Katy, Republic of Texas
Another T4 15w-40 recommendation.
A stout oil that will work with the old school engine. Even on the coldest days in Georgia it should not be an issue.
_________________________
1994 Honda VT1100C: Peak 15w-40/TG/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI


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#4685701 - 03/05/18 09:20 PM Re: Rotella T4 or T6 in SBC 350? [Re: Pike51]
BrocLuno Offline


Registered: 09/06/15
Posts: 5514
Loc: Kalifornia Kollective
OK, this is a low mileage engine. Either a crate motor, or a rebuild. But that means the bearings were done. So they are now around 0.0025" and they do not need 40 grade.

I'll also bet this thing sits a week at a time between outings ... So it may exhibit some "drain-off" with synthetics. Meaning that it might be slightly noisy on cold start ... Dino's are usually better for engines that sit. They maintain a stronger capillary fill.

I'd go to Delo 400 15W-30 SD (severe duty) or Valvoline VR-1 xW-30 (Silver Bottle). Both have very good add paks for flat tappet cams. Since you did not state the cam config, I'm assuming flat tappet ... I would not mess with less than 1,100 PPM Zn & Ph with an old school SBC. Just not worth it ... frown

There is absolutely no proof that synthetics lube better than quality Dino oils. There are no professional papers or engineering studies that state this. And there are a few million over the road trucks with million mile motors on good old dino HDEO smile

Synthetics are good at heat rejection and long change intervals. As long as this car will not be raced (roundy round for hours at a time), or you are not going to try for 10,000 mile oil changes, they buy you nothing ...

Keep it simple, and have fun smile



Edited by BrocLuno (03/05/18 09:22 PM)
_________________________
Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.

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#4686000 - 03/06/18 08:10 AM Re: Rotella T4 or T6 in SBC 350? [Re: Linctex]
FordCapriDriver Offline


Registered: 10/22/15
Posts: 2379
Loc: Balearic Islands , Spain
Originally Posted By: Linctex
Another vote for T4 15W-40 (actually, any 15W-40 HDEO, will be fine, it doesn't have to be Rotella)

Well, Rotella is a safe bet as the Zddp level is still a good 1200ppm, which is one of the main reasons to use a HDEO in an older car.
_________________________
1975 Ford Capri II Ghia 3000 V6, - Valvoline VR1 20W-50
1988 Ford Escort MkIV 1.6 Xr3i Cabrio, - Shell Rimula R4X 15W-40 HDEO.

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#4686271 - 03/06/18 12:47 PM Re: Rotella T4 or T6 in SBC 350? [Re: FordCapriDriver]
vintageant Offline


Registered: 10/27/06
Posts: 427
Loc: Florida, USA
If you want to compare zinc phos & moly in 15W40s:

_________________________
1925 Alvis HDEO 15W40
1937 Alvis Speed 25 20W50 w LM MoS2 & LM MOS
1970 VW Peking - Paris Rally Beetle HDEO 15W40 w LM MoS2
1987 Porsche 924S HDEO 15W40

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