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What oil does a 4.3 vortec like the best? #3129315 09/19/13 07:52 AM
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Realtech214 Offline OP
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Dino, Synthetic, 5w30 o 15w40 something thicker? would like to hear from other 4.3 guys out there


2015 Silverado Crew Cab 5.3 LT 120,xxx miles
2001 Suburban LT 145,xxx miles
- - - - - -
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129330 09/19/13 08:06 AM
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TechnoLoGs Offline
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Well.......

In mine, I put in normal dino Supertech 10W-40 (I have found Supertech 10W-40 to be on the thin side, made general mental note "Supertech oil is on the thin side.")

I am next thinking of trying GC, or Castrol Syntec 0W-30, in there. Even 0W-40, depending. Maybe.

You can run almost anything......

I was going to put in Redline 0W-20, but that's pretty overkill for a 4.3...

I also hear Castrol GTX 5S-30 is a darn good oil for a 4.3.

OK other 4.3 guys?

*My engine model year of Vortec 4.3 is 1994. Same mechanicals as 1995. Is in pre-1996 Vortec category, but 1994/1995 are supposed to have had the best heads from pre-96 Vortecs, as pers10forum.com lengthy thread...


1993 Chevrolet S-10 Blazer 4.3, the Frankenblazer - 184,440mi. 10/22/13 - WPP Supertech 10W-40
12,359 10/22 12,361 10/23 12,365 10/24 12,369 10/25
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129338 09/19/13 08:14 AM
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addyguy Offline
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PYB 5w-30 or 10w-30 would be a great choice...this engine seems to like the high moly.
JMO....


2010 Kia Soul 2U - 2.0L I-4, auto; 153k miles.
Castrol GTX 5W-20; Motomaster MPH 9688

2009 Pontiac G5 - 2.2 I-4, auto, 121k miles.
Oil/filter TBD
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129339 09/19/13 08:16 AM
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Reg# 43897 Offline
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-Correct me if I'm wrong-
Ain't it basically just a SBC less two cylinders?

John.

Re: What oil does a 4.3 vortec like the best? [Re: addyguy] #3129349 09/19/13 08:20 AM
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Realtech214 Offline OP
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Originally Posted By: addyguy
PYB 5w-30 or 10w-30 would be a great choice...this engine seems to like the high moly.
JMO....


Thats what I've found too


2015 Silverado Crew Cab 5.3 LT 120,xxx miles
2001 Suburban LT 145,xxx miles
- - - - - -
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129373 09/19/13 08:42 AM
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JHZR2 Offline
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Some of the best UOAs Ive seen were on PYB. This engine isnt picky, just make sure the radiator cap is right and that the intake manifold isnt leaking...

Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129376 09/19/13 08:45 AM
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bigt61 Offline
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4.3's like whatever is on sale - they aren't picky. Yes - it's a 3/4 SBC. "The 4.3L V6 has a 4.00-inch bore and a 3.48-inch stroke, identical to the 350 cid Chevrolet V8 engine." - Wiki


92 Suburban 2500 7.4L 58k M1_0w40 5yr OCI
99 Olds Aurora 4.0L 91K M1_5w30 5yr OCI
13 Dodge Dart 2.0L 30k PP 0w20 OLM OCI
70 Camaro 5.7L 59k
Re: What oil does a 4.3 vortec like the best? [Re: bigt61] #3129385 09/19/13 09:04 AM
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TechnoLoGs Offline
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Originally Posted By: bigt61
4.3's like whatever is on sale - they aren't picky. Yes - it's a 3/4 SBC. "The 4.3L V6 has a 4.00-inch bore and a 3.48-inch stroke, identical to the 350 cid Chevrolet V8 engine." - Wiki


I thought piston skirts were different? I keep hearing they are near-identical, bu twith some differences, like you say.

And -2 cylinders laugh

So, PYB it likes... Hmmm....


1993 Chevrolet S-10 Blazer 4.3, the Frankenblazer - 184,440mi. 10/22/13 - WPP Supertech 10W-40
12,359 10/22 12,361 10/23 12,365 10/24 12,369 10/25
Re: What oil does a 4.3 vortec like the best? [Re: JHZR2] #3129389 09/19/13 09:09 AM
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TechnoLoGs Offline
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Originally Posted By: JHZR2
Some of the best UOAs Ive seen were on PYB. This engine isnt picky, just make sure the radiator cap is right and that the intake manifold isnt leaking...




^^ Like this? 16lbs Psi is that the right one?

Or 15lbs...

?

Re: What oil does a 4.3 vortec like the best? [Re: Reg# 43897] #3129394 09/19/13 09:13 AM
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nitehawk55 Offline
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Originally Posted By: Reg# 43897
-Correct me if I'm wrong-
Ain't it basically just a SBC less two cylinders?

John.


Yes , the 5.7 minus 2 cyl .

A diet of 5W30 of whatever is on sale is all my 4.3 gets . They as well as any SBC engine is not fussy and easy keepers .


05 Ford Five Hundred AWD 3.0 DOHC V6 CVT tranny
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129419 09/19/13 09:43 AM
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gfh77665 Online Content
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I have run a wide variety of oils of different brands and viscosities (even some straight weights!) in mine and it NEVER complains. Zero issues, Zero consumption. I agree with the comments above, its a very tolerant engine.

Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129426 09/19/13 09:49 AM
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When I had a 4.3 in an automotive application, it would get 5w30 synthetic.

In marine applications, I use Rotella T5 10w30 or Delvac 15w40, depending on whats on sale or rebate at the time.

With that being said, I totally agree - the 4.3 would be content on anything.


'13 Chevy Volt
'07 Prius, 215k miles
'18 F150, 2.7EB
'08 Saab 9-7x, 5.3l V8
97 FW Vista 278
T-4.3Gi 185hr&
4kw genset 17hr- T5
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129446 09/19/13 10:14 AM
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Gabe Offline
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My Bravada is favoring Castrol FST these days.

I avoid the sodium additive packages since it makes a leaking gasket - as opposed to the leaking hoses, heater core, water pump, ect - tougher to detect. UOA shows that my truck doesn't like conventional oil nearly as much as the fancy synthetics, but it might be Chicago driving. The oil also shows more shearing that I would have expected from ACEA A1 oils.

I am not sure about running a thicker oil. Castrol GTX HM did not produce the results I expected, but it might just have been that specific oil.

Re: What oil does a 4.3 vortec like the best? [Re: Gabe] #3129489 09/19/13 11:04 AM
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KCJeep Offline
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Originally Posted By: Gabe
Castrol GTX HM did not produce the results I expected, but it might just have been that specific oil.


Me either but I had some other stuff going on too.

I had a 4.3 for 12 years and as stated above I did not find it particular at all. Maxlife would be a good match among others.


2018 VW Passat GT VR6 - 28k - Castrol Pro OE 5w40 - VW OEM filter
2012 KIA Sedona 107k - Valvoline Maxlife 5w30
2012 VW Tiguan 108k - Castrol 0w40
2004 Jeep Grand Cherokee, gone but not forgotten.
Re: What oil does a 4.3 vortec like the best? [Re: Realtech214] #3129528 09/19/13 11:39 AM
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5w30 the cheapest sn rated oil you can find is the best possible oil there is.
If one oil was better the oil companies would put it on every bottle they make it would say something like this oil is much better than all the rest!

Ratings are ratings period!


Check To See That The Oil Jugs You Buy Have The Exact Amount Of Oil In Them And Have An Inner Seal Under The Cap. I Use Mobil 1 And Fram Ultra Filters
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