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#3353701 - 04/26/14 09:29 AM Re: 1978 Ford LTD 351M QSGB 10w-30 2800 miles [Re: Merkava_4]
jayg Offline


Registered: 10/04/12
Posts: 422
Loc: Acworth, GA
Originally Posted By: Merkava_4
Originally Posted By: Garak
20w-50 isn't a good match for much of anything, unless something is worn out to high heaven.


It was an excellent match for my Dad's Cadillac DeVille with the 7.0L V8. The engine ran much smoother and quieter on Superflo 20W-50 than it did on VWB 10W-30. The engine wasn't worn out either, it only had 15K on it after a rebuild. It ran so quiet on 20W-50, all I could hear was the air being sucked into the carburetor and the fan belts going around. Add that sound with a very slight gurgle exhaust note from that beautiful V8 and it was music to my ears. The car would lay a patch of rubber 25ft long on the pavement ... and that was with stock 2:73 gears. I miss that car dearly.


Pretty much all your advice includes "sounded better or ran smoother". No real data. Running a 20w50 will not make a a difference in a old car that is driven 3 miles. Fuel dilution from a carburetor is more prone to do the same thing to any oil that is ran. Any oil changed at 3k miles intervals would look pretty much the same. The key with this motor is run whatever you have laying around but change it often.
_________________________
'14 Jeep Wrangler Sport S 6sp 10k OCI PYB 5w20
'73 Datsun 240Z 4sp (AutoX) Vintage QS 10w40
'91 Honda CB250 Nighthawk (Cafe modded)VBB 20w50


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#3354199 - 04/26/14 09:27 PM Re: 1978 Ford LTD 351M QSGB 10w-30 2800 miles [Re: fdcg27]
SS1970chrysler Offline


Registered: 05/01/11
Posts: 1345
Loc: PA
Originally Posted By: fdcg27
This doesn't look good, but we have nothing to compare it with.
It may be that all old Ford 351s (C,M or W) shed metals like this.
Good to see a post from you, though.
Haven't seen that much of you since the epic Granada thread.

yep, I'm still around. Haven't posted much as driving the Caddy and my new shorter commute isn't very exciting. I'll be doing one more UOA on the caddy as I'll be sticking with 5-6k OCI's on that one until it's dead or not worth running. I'll also add an upcoming treat: a UOA on my backup driver: 63 Chrysler. It's had the Family dollar 10w-40 I used for cleaning in for a year now.
As for this LTD, I'm slowly scaling up the oil grades until I find something it won't kill, but still able to start in winter. Cold starts are a factor on this car.
_________________________
93 Towncar- PYB 5w-30+M.Craft
93 CrownVic- PYB 5w-30+M.Craft
78 LTD- S.Pro XHD30+ProTec

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#3355941 - 04/28/14 06:13 PM Re: 1978 Ford LTD 351M QSGB 10w-30 2800 miles [Re: Merkava_4]
Garak Offline


Registered: 12/05/09
Posts: 13561
Loc: Regina, Saskatchewan, Canada
Originally Posted By: Merkava_4
It was an excellent match for my Dad's Cadillac DeVille with the 7.0L V8. The engine ran much smoother and quieter on Superflo 20W-50 than it did on VWB 10W-30.

Unfortunately for the smoothness/sound tests, there are no sound or smoothness benchmarks in any API, ILSAC, ACEA, or manufacturers' specifications. wink
_________________________
Plain, simple Garak.

2008 Infiniti G37 coupe - Mobil Delvac 1 ESP 5w-40, Wix 51358
1984 F-150 4.9L six - Quaker State GB 10w-30, Wix 51515

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#3360544 - 05/03/14 09:14 AM Re: 1978 Ford LTD 351M QSGB 10w-30 2800 miles [Re: SS1970chrysler]
fdcg27 Offline


Registered: 09/25/09
Posts: 10919
Loc: OH
A 10W-40 might hold up a little better and would still allow for relatively easy winter starts.
I used that grade in a variety of engines back in the day and never had problems with winter starts.
_________________________
12 Accord LX 36K PP 0W-20
09 Forester 67K PU 5W-30
02 Accord 144K GOil 5W-30
01 Focus ZX3 101K Meijer Syn 5W-20
95 BMW 318iC 150K Defy 10W-40

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#3362902 - 05/05/14 09:23 PM Re: 1978 Ford LTD 351M QSGB 10w-30 2800 miles [Re: fdcg27]
SS1970chrysler Offline


Registered: 05/01/11
Posts: 1345
Loc: PA
Originally Posted By: fdcg27
A 10W-40 might hold up a little better and would still allow for relatively easy winter starts.
I used that grade in a variety of engines back in the day and never had problems with winter starts.

That may be next. This fill was 2 leftover qts of 10w-30 Defy, and the rest was my free XHD30. I also had to fill the car before results could come back. I'd thought about T5 for this one, but would it be a waste with no miles getting put on it really?
_________________________
93 Towncar- PYB 5w-30+M.Craft
93 CrownVic- PYB 5w-30+M.Craft
78 LTD- S.Pro XHD30+ProTec

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