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1995 Chevy 350, P30 - Do I want to use synthetic? #4612828
12/24/17 09:56 AM
12/24/17 09:56 AM
Joined: Dec 2017
Posts: 1
Florida-Panhandle
moretsky99 Offline OP
moretsky99  Offline OP
Joined: Dec 2017
Posts: 1
Florida-Panhandle
Anyone have a P30 out there? I just got a 1995 P30 Step Van. I'm converting to an ice cream truck. The truck is powered by a 350 Chevy engine. The truck has 140,000 on it.

I read posts here about using oil and decided that my first oil change would be a Castrol GTX High Mileage 5/30 which I did. I'd like to move to synthetic, but I've read about potential leaky seals with the 350 Chevy engine. The truck is new to me. I just installed new spark plugs. Absolutely no oil around the plugs. Does this necessarily mean that seals are good or only the rings? Is it worth the trouble to convert to synthetic? I do my own oil changes on my vehicles, my other being a sedan. I like that I can find synthetic oil with filter for $23-25 and not change oil for 6,000 miles vs 3,000 with conventional oil. Keep in mind this vehicle, as an ice cream truck, will idle a lot or crawl through neighborhoods.

Opinions, please.

Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612836
12/24/17 10:04 AM
12/24/17 10:04 AM
Joined: Oct 2017
Posts: 637
Georgia
MParr Offline
MParr  Offline
Joined: Oct 2017
Posts: 637
Georgia
Move up to Castrol GTX High Mileage 10W30 or any other high mileage brand of 10W30.


2013 KIA Optima EX 2.4L. Now: QSUD 5W30 & STP S2808ML
2017 Ford Escape SE 2.0T Now: Pennzoil Platinum 5W30 & Motorcraft 910s
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612838
12/24/17 10:04 AM
12/24/17 10:04 AM
Joined: Apr 2015
Posts: 279
Georgia
Charlie2015 Offline
Charlie2015  Offline
Joined: Apr 2015
Posts: 279
Georgia
Use synthetic, fix whatever seal leaks there are, and keep it full of oil.


1998 Honda Accord EX 2.3L Auto
2009 Scion TC Manual
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612850
12/24/17 10:12 AM
12/24/17 10:12 AM
Joined: Sep 2009
Posts: 16,026
OH
fdcg27 Offline
fdcg27  Offline
Joined: Sep 2009
Posts: 16,026
OH
M1 HM in either the 10W-30 or 10W-40 grade.
Hit some AZs in the next few days and you may be able to pick up the ten forty for two bucks a quart.


17 Forester 18K VME 0W-20
12 Accord LX 92K PP 5W-20
09 Forester 95K M1HM 10W-30
01 Focus ZX3 118K PP 5W-20
96 Accord LX 104K T5 10W-30
95 318i
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612854
12/24/17 10:14 AM
12/24/17 10:14 AM
Joined: Oct 2004
Posts: 7,988
Cincinnati, OH, USA
bullwinkle Offline
bullwinkle  Offline
Joined: Oct 2004
Posts: 7,988
Cincinnati, OH, USA
If you use synthetic, the Valvoline Synthetic with MaxLife Technology is a good choice-full syn with seal swellers in it. M1 HM would be my second choice. I had a '94 TBI 350 Suburban with over 200K, it actually did the best on 20W50 Maxlife syn blend-but the 20W50 might be a little tougher to find these days.


06 Ram 3500 CTD 4X4(FG Venturi), 93 GMC C3500 6.2, 89 F-450 7.3, 98 XJ 4.0(XG8A), 05 xB(XG3600), 18 Transit 3.7, 03 Merc Grand Marquis 4.6 2V(XG2)
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612857
12/24/17 10:16 AM
12/24/17 10:16 AM
Joined: May 2010
Posts: 9,064
North Carolina
spasm3 Offline
spasm3  Offline
Joined: May 2010
Posts: 9,064
North Carolina
Florida, 1995, perfect for 10w 30. I'll echo the other posters, HM 10w-30


13 elantra 70k 5w30 QSUD
03 chevy avalanche79k synpwr 10w30
01 saturnsc1 185k synpwr rebuilt
17 mazda cx-5 5600 miles m1 0w30
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612863
12/24/17 10:19 AM
12/24/17 10:19 AM
Joined: Jul 2016
Posts: 168
EasTn
Sealbilly Offline
Sealbilly  Offline
Joined: Jul 2016
Posts: 168
EasTn
The old 350 motors aren't picky about oil. You could run a 10w30 or 10w40 easily. Most of the synthetics on the market today won't cause leaks that I have seen. A good oil that is semi synthetic in a 10w30 weight is Rotella T5. Would be a good choice for your application. It's cheap and you can find it anywhere.

Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612866
12/24/17 10:21 AM
12/24/17 10:21 AM
Joined: Mar 2012
Posts: 804
BerksCounty/Pa.
thorromig Offline
thorromig  Offline
Joined: Mar 2012
Posts: 804
BerksCounty/Pa.
Run any decent HM synthetic oil 10W30 with a good filter in Florida & make the kiddies happy!!!


00 Dodge Ram 5.2L 4x4 Edge 10W30 FU (91K)
08 Acura TL Type S 3.5L PUPP 5W20 FU (101K)
17 Jetta TSI SE 1.4L Turbo - Edge 0W40 FU (Hers) (4K)
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: MParr] #4612871
12/24/17 10:24 AM
12/24/17 10:24 AM
Joined: Oct 2014
Posts: 1,225
NoVA
Jimzz Offline
Jimzz  Offline
Joined: Oct 2014
Posts: 1,225
NoVA
Originally Posted By: MParr
Move up to Castrol GTX High Mileage 10W30 or any other high mileage brand of 10W30.



I agree with this. A good Semi-syn High mileage oil like Castrol or Valvoline Maxlife would get my vote.

And 10w30 is a good choice for a older motor and/or warm locations like FL.


yup
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612872
12/24/17 10:24 AM
12/24/17 10:24 AM
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
Alex_V Offline
Alex_V  Offline
Joined: Apr 2016
Posts: 1,185
Campbellsville, KY
"Converting to synthetic" is an overstatement. Many owners who don't have a clue - and even some that do - flop back and forth without a problem. I, however, believe in finding an oil that I have peace of mind in for the vehicle in question, and sticking with it.

I'd use a 10w30 or 5w40 in your application. Start with a high mileage syn or syn blend in 10w30 (my go-to would be Maxlife) and if it doesn't leak or use much of it, stick with it. My dad has a '97 Suburban with a 350 - several months ago it had 430K on it and still runs like it's got less than 100K on it. He got it at 170K, 11 years ago, and has used Maxlife 10w30 or '40 in it ever since. The 350 is a good power plant.

5w40's don't come in as many (if any?) varieties of a high mileage formulation, but if it doesn't leak much a HM oil isn't a necessity. Outside the realm of HM oils, Rotella T5 is available in 10w30 and T6 in 5w40. I'm also partial to Schaeffer's products and use their 10w30 ('85 GMC 454) and 5w40 ('82 Benz diesel) - I believe Schaeffer is a very resilient oil and worth the extra money.

Last edited by Alex_V; 12/24/17 10:31 AM.

I like Chevy and Valvoline.

'13 Cruze, 1.4T, 113K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 169K
'67 Suburban, 350, 331K
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612908
12/24/17 11:05 AM
12/24/17 11:05 AM
Joined: Sep 2004
Posts: 7,532
Marshfield , MA
andyd Offline
andyd  Offline
Joined: Sep 2004
Posts: 7,532
Marshfield , MA
at least 10w30 for idling and something for seal maintenance. Thicker oil with the numbers as close as possible was the old mantra. Just like necktie width, oil fashions change. You really can't make a bad choice in oil these days. PS All my ties are wide. Merry Xmas grin2


'16 Camry LE STP synth 0w20 and STP filter. the Fridge

1994 Ranger ,the Rat, 5w30 dino, STP filter

'16 Camry SE, Valvoline HM 0w20 and OEM filter
Thick oil is better grin2
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4612945
12/24/17 11:41 AM
12/24/17 11:41 AM
Joined: Nov 2008
Posts: 12,564
NH
supton Online content
supton  Online Content
Joined: Nov 2008
Posts: 12,564
NH
On a new to me 350 in Florida I'd probably go with a cheap conventional 10W30, or any xW30, and run it for a bit. And see what it does. I'd hate to pour in Royal Purple only to find it drinks oil like a sailor! In a big truck I'd think xW30 would be fine around town, and xW40 if sustained highway.

Lots of low speed driving, kinda points me to think of shorter OCI's. Many of these engines went to huge miles on 3k OCI's and conventional. I'm not sure I'd over-think it.


2011 Toyota Camry, base, 2.5L/6MT, 163k, hers
2010 Toyota Tundra DC, 4.6L/6AT, 144k, ours
1999 Toyota Camry LE, 2.2L/4AT, 190k, his
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4613012
12/24/17 12:51 PM
12/24/17 12:51 PM
Joined: May 2012
Posts: 5,387
Fort Lauderdale, FL
DoubleWasp Offline
DoubleWasp  Offline
Joined: May 2012
Posts: 5,387
Fort Lauderdale, FL
Don't waste any money on synthetic.

Use a good 10/30 HM and forget it.

That engine is not going to die of a lube related issue, or even suffer by one.

I would do one UOA to find out if your are suffering from high fuel dilution with it being a TBI engine. If you have FD issues, you're going to want to keep that OCI shorter.

I would get new fuel injectors on that engine one way or another. When they get old and less efficient, they can cause serious FD issues.


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
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4613022
12/24/17 01:03 PM
12/24/17 01:03 PM
Joined: Jan 2003
Posts: 1,016
Elizabeth. Colorado
c502cid Offline
c502cid  Offline
Joined: Jan 2003
Posts: 1,016
Elizabeth. Colorado
10w-40HM all day long. Walmart Supertech is cheap and available. In your climate and with all the idling I might even go 15w-40. Your motor will thank you. Some fresh ATF won't hurt either. Walmart ATF (Dex3/Mercon spec) will work great here too.


17 SuperDuty 6.2 4x4
15 Chev Trax AWD
02 GMC 3500 8.1/Allison 4x4
00 Blazer 4x4
97/98 Civic's
84 Chev K30 454EFI 4x4
71 GMC Jimmy 502 RamJet
Re: 1995 Chevy 350, P30 - Do I want to use synthetic? [Re: moretsky99] #4613037
12/24/17 01:26 PM
12/24/17 01:26 PM
Joined: Feb 2014
Posts: 2,288
Kansan,1911 45ACP fan
Marco620 Offline
Marco620  Offline
Joined: Feb 2014
Posts: 2,288
Kansan,1911 45ACP fan
Quaker State HM 10w30/40.


15' Civic 179k.0w20 Redline/Archoil9100,Eibach,Yokohama/Borla Exhaust/Tein Suspension/Fu7317/Redline Si-1
Right to work state proud. Non union household
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