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 Post subject: Synthetic oil?
PostPosted:Wed Jun 18, 2014 11:16 am 
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Big Block
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Joined:Tue Feb 23, 2010 12:40 pm
Posts:3245
Car Details:'79 Camaro, 350 V8
Location:South Bucks
Looking at doing an oil change soon on the 305 tpi. Found Castrol Edge 5W30 Fully Synthetic at a good price. Will this be ok? I remember reading 5w30 on the dipstick but not sure if it should be non / part or fully synthetic? Engine is factory tune and no plans to do much to it.

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Synthetic oil?

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 Post subject: Re: Synthetic oil?
PostPosted:Wed Jun 18, 2014 1:05 pm 
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Big Block
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Joined:Fri Mar 19, 2010 1:35 am
Posts:2566
Car Details:79' camaro road & track day toy. 383 stroker, 5 speed TKO trans, lots of suspension stuff, 13" Vette brakes, 18" wheels.
Location:Luton
Don't think you'll go wrong you'll fully synthetic on the 305.

I think non synthetic is recommended for older engines than need thicker organic oil.

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 Post subject: Re: Synthetic oil?
PostPosted:Fri Jun 20, 2014 6:50 pm 
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Big Block

Joined:Wed Jul 15, 2009 6:48 pm
Posts:493
Car Details:68 pontiac firebird coupe project car,my aim is a street friendly,lightly modified pro.touring style.
Lowered ,mild body mods,400 cu in SBC engine, Muncie 4speed, 10 bolt posi axle,disc front drum rear.
68 firebird convertible ( long term project) Stock resto/mod style ,400 pontiac th350
You may notice a tendency for your engine to leak past gaskets with a thinner synthetic oil also crank seals...
Also might increase smoke caused by valve seal issues ans also ring sealing on older engines .
Just Sayin'


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 Post subject: Re: Synthetic oil?
PostPosted:Sat Jun 21, 2014 12:02 pm 
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Big Block

Joined:Thu Nov 12, 2009 10:24 am
Posts:219
Car Details:88 IROC Convertible
305 Tpi
Yep recently did this. Used Castrol EDGE in my 305 tpi. Works a treat. Just pour in the 5ltrs and wait a while before checking the levels.

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 Post subject: Re: Synthetic oil?
PostPosted:Mon Jun 23, 2014 12:54 pm 
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Big Block
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Joined:Fri Mar 19, 2010 1:35 am
Posts:2566
Car Details:79' camaro road & track day toy. 383 stroker, 5 speed TKO trans, lots of suspension stuff, 13" Vette brakes, 18" wheels.
Location:Luton
Quote:
You may notice a tendency for your engine to leak past gaskets with a thinner synthetic oil also crank seals...
Also might increase smoke caused by valve seal issues ans also ring sealing on older engines .
Just Sayin'
Think that's more likely on older engines with bigger tolerances, or higher mile versions... could go up to 10-40 full synthetic (what I use) to stay a bit thicker if concerned.
I think the benefits of a good modern synthetic are well worth it..

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 Post subject: Re: Synthetic oil?
PostPosted:Mon Jun 23, 2014 7:42 pm 
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Big Block
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Joined:Tue Feb 23, 2010 12:40 pm
Posts:3245
Car Details:'79 Camaro, 350 V8
Location:South Bucks
Good thoughts here, thank you!

It already kicks a bit of blue smoke on start up, so i think it needs replacement valve seals :( It doesnt smoke when idling / driving, just on initial startup.

You reminded me of some vids i saw a little while ago about synthetic oil, found them and posted below.

I wonder, if fully synthetic is "thinner", then would a 10W 40 fully synthetic be a good compromise?








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How to post youtube vids: Click on the 'youtubeHD' button at the top of the message box and in the middle of the ][ brackets that just appeared, copy and paste everything from the youtube web address that appears after the = sign i.e if this is the url: https://www.youtube.com/watch?v=K2cNqaPSHv0 just copy "K2cNqaPSHv0").


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 Post subject: Re: Synthetic oil?
PostPosted:Wed Jun 25, 2014 9:46 pm 
Offline
Big Block

Joined:Wed Jul 15, 2009 6:48 pm
Posts:493
Car Details:68 pontiac firebird coupe project car,my aim is a street friendly,lightly modified pro.touring style.
Lowered ,mild body mods,400 cu in SBC engine, Muncie 4speed, 10 bolt posi axle,disc front drum rear.
68 firebird convertible ( long term project) Stock resto/mod style ,400 pontiac th350
Quote:
Quote:
You may notice a tendency for your engine to leak past gaskets with a thinner synthetic oil also crank seals...
Also might increase smoke caused by valve seal issues ans also ring sealing on older engines .
Just Sayin'
Think that's more likely on older engines with bigger tolerances, or higher mile versions... could go up to 10-40 full synthetic (what I use) to stay a bit thicker if concerned.
I think the benefits of a good modern synthetic are well worth it..
You are probably right on the 10-40 Stu, better for the older engines and has the advantages of synthetic.
The reason GM specified the thinner grade was more to do with the dreaded CAFE fuel averages that the US Gov.used to punish manufacturers for making vehicles that had any performance or fun potential :thumbdown:
Thin oil helps mpg but does little for engine protection under stress...


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