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Rotella T4 or T6 in SBC 350? #4684968
03/05/18 10:20 AM
03/05/18 10:20 AM
Joined: Jul 2017
Posts: 96
GA
Pike51 Offline OP
Pike51  Offline OP
Joined: Jul 2017
Posts: 96
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
Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4684982
03/05/18 10:34 AM
03/05/18 10:34 AM
Joined: Jan 2017
Posts: 1,299
Toronna
maxdustington Offline
maxdustington  Offline
Joined: Jan 2017
Posts: 1,299
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
Edge 0W40 + Mann 719/30
Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4684990
03/05/18 10:43 AM
03/05/18 10:43 AM
Joined: Oct 2014
Posts: 11,839
Idaho
CT8 Offline
CT8  Offline
Joined: Oct 2014
Posts: 11,839
Idaho
The 15w is better above freezing.


2015 Ford F150 2.7
2018 Ford F350 6.2
Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4685138
03/05/18 01:10 PM
03/05/18 01:10 PM
Joined: Oct 2015
Posts: 2,654
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,654
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, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4685384
03/05/18 05:45 PM
03/05/18 05:45 PM
Joined: Mar 2008
Posts: 6,811
USA
slacktide_bitog Offline
slacktide_bitog  Offline
Joined: Mar 2008
Posts: 6,811
USA
If you can't decide between T4 or T6, try T5 smile

Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4685445
03/05/18 06:46 PM
03/05/18 06:46 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
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."
Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4685558
03/05/18 08:35 PM
03/05/18 08:35 PM
Joined: Aug 2004
Posts: 4,636
Katy, Republic of Texas
blupupher Offline
blupupher  Offline
Joined: Aug 2004
Posts: 4,636
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 VT1100: Peak 15w-40/PSL/2500 mile OCI
2002 Ford F150: GTX HM 5w-20/EcoGard Syn/1yr OCI
2012 Scion xB: QSUD 0w-20/CQ Blue/5k OCI

Re: Rotella T4 or T6 in SBC 350? [Re: Pike51] #4685701
03/05/18 10:20 PM
03/05/18 10:20 PM
Joined: Sep 2015
Posts: 5,849
Kalifornia Kollective
BrocLuno Offline
BrocLuno  Offline
Joined: Sep 2015
Posts: 5,849
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


Last edited by BrocLuno; 03/05/18 10:22 PM.

Formerly in marine engineering. In an earlier life I owned my own petroleum tank truck, and hauled for the majors and independent's.
Re: Rotella T4 or T6 in SBC 350? [Re: Linctex] #4686000
03/06/18 09:10 AM
03/06/18 09:10 AM
Joined: Oct 2015
Posts: 2,654
Balearic Islands , Spain
FordCapriDriver Offline
FordCapriDriver  Offline
Joined: Oct 2015
Posts: 2,654
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, - Shell Helix HX3 20W-50 w/ 20% Rimula R4X 15W-40 HDEO.

1988 Ford Escort Mk4 Xr3i Cabrio, - Shell Rimula R4X 15W-40, w/ 30% Helix 3 20W-50.
Re: Rotella T4 or T6 in SBC 350? [Re: FordCapriDriver] #4686271
03/06/18 01:47 PM
03/06/18 01:47 PM
Joined: Oct 2006
Posts: 429
Florida, USA
vintageant Offline
vintageant  Offline
Joined: Oct 2006
Posts: 429
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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