350 gm good wrench made in Mexico crate motor type of oil to use
Thread Starter
Junior Member
Joined: May 2017
Posts: 3
Likes: 0
350 gm good wrench made in Mexico crate motor type of oil to use
I have a 350 made in Mexico crate motor from I belive from late 80s early 90s. I didn't know what weight oil or if I have to run zinc additives.
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
Amsoil SAE 30 Break In oil for 500 miles.
After that,
Amsoil 10w40 Premium Protection. Change it every 5,000.
GD
After that,
Amsoil 10w40 Premium Protection. Change it every 5,000.
GD
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
IS it flat tappet or roller?
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
Get a higher zinc oil then. Rotella T at a minimum will work I like Lucas 10w-40 hotrod oil. Use what you like
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
The Amsoil break in has 2000 PPM zinc.
The Premium Protection has 1400.
They are designed for exactly this purpose.
GD
The Premium Protection has 1400.
They are designed for exactly this purpose.
GD
Joined: Mar 2000
Posts: 43,187
Likes: 43
From: Littleton, CO USA
Car: 82 Berlinetta/57 Bel Air
Engine: L92/LQ4 (both w/4" stroke)
Transmission: 4L80E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
I would tend toward the AMSOIL 10W-30 Z-Rod, as 10W-40 isn't required for that engine. The Z-Rod also has high ZDDP, and was specifically designed for flat tappet engines.
http://www.amsoil.com/shop/by-produc...?code=ZRTQT-EA
Remember, though, the ZDDP PPM isn't the whole story with regard to flat tappet wear protection. It's the total package that matters.
http://www.amsoil.com/shop/by-produc...?code=ZRTQT-EA
Remember, though, the ZDDP PPM isn't the whole story with regard to flat tappet wear protection. It's the total package that matters.
Trending Topics
Joined: Mar 2017
Posts: 4,255
Likes: 427
From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
True. The Z-Rod is probably the better choice. If the engine is new then the 10w30 for sure.
I run the 10w40 in all my high mileage stuff. My Trans Am has 155k on the original 305. While it probably had *some* good maintenance it almost certainly never got any synthetic. Hadn't seen the road since 2004 when I got it in 2015 so....
Helps with consumption and keeping pressure up in older engines. The synthetics flow so much better and hold their viscosity stable much longer than conventional so using a 40 weight isn't really much different than what the 30 weight becomes toward the end of its life anyway as it tends to thicken.
We routinely run 20w50 in the high tolerance aluminium block engines. Just REALLY requires warming them up prior to driving as the main bearing clearances need stable block and oil temps to achieve proper operating clearance.
GD
I run the 10w40 in all my high mileage stuff. My Trans Am has 155k on the original 305. While it probably had *some* good maintenance it almost certainly never got any synthetic. Hadn't seen the road since 2004 when I got it in 2015 so....
Helps with consumption and keeping pressure up in older engines. The synthetics flow so much better and hold their viscosity stable much longer than conventional so using a 40 weight isn't really much different than what the 30 weight becomes toward the end of its life anyway as it tends to thicken.
We routinely run 20w50 in the high tolerance aluminium block engines. Just REALLY requires warming them up prior to driving as the main bearing clearances need stable block and oil temps to achieve proper operating clearance.
GD
Joined: Jun 2010
Posts: 648
Likes: 0
From: San Antonio, TX
Car: 1982 Camaro Berlinetta
Engine: GM crate motor Goodwrench 5.7 350
Transmission: 700R4
Axle/Gears: 3.23
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
I have used both 10w30 synthetic or blend or 5w30 full synthetic on my Goodwrench with no issues at all
Senior Member
Joined: Jul 2016
Posts: 786
Likes: 207
From: az
Car: 91 WS6 GTA
Engine: 5.3
Transmission: 4l60e
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
whatever oil is on sale, and everyother oil change a bottle of additive from somewhere like summit.
https://www.summitracing.com/parts/luc-10063-1
https://www.summitracing.com/parts/luc-10063-1
Supreme Member
Joined: Oct 2004
Posts: 4,528
Likes: 240
From: Henrietta NY
Car: 1984 Trans Am L69
Engine: Sniper EFI Powered 355
Transmission: WC T5 w/ Steel Support Plate
Axle/Gears: 3.42 10 Bolt Posi
Re: 350 gm good wrench made in Mexico crate motor type of oil to use
https://www.summitracing.com/search/...oview=SKU&ar=1
Either of these 10w-40 or 10w-30 had enough zddp to not need the extra break in 2100ppm.
https://lucasoil.com/pdf/Zinc_Values_MotorcycleOil.pdf
Either of these 10w-40 or 10w-30 had enough zddp to not need the extra break in 2100ppm.
https://lucasoil.com/pdf/Zinc_Values_MotorcycleOil.pdf