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Oil, Synthetic Vs Conventional With Boost

  • Thread starter Thread starter skennington
  • Start date Start date Mar 21, 2010
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skennington

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Mar 21, 2010
#1
  • Mar 21, 2010
  • #1
What are your opinions and experiences? My care is a 95 vert with full H/C/I, all forged internals and a V2 making approx 8 lbs of boost (3.00 pulley).

The engine has about 8k on it, just recently changed the oil and used a synthetic for the first time (castol syntec 5w30). I'm experiencing more blow-by with this oil. I have heard some builders swear by dino for boosted cars and others say it doesn't matter.

Just so you know, I have bypassed my pcv and vented to the atmosphere through the valve covers. It has never blown the dipstick ever so I don't feel like the CC pressure is that excessive.

Any and all comments/feedback would be great!

/Steve
 

GTA_V6_Mustang

Active Member
Nov 29, 2004
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39
Miami, FL
Mar 21, 2010
#2
  • Mar 21, 2010
  • #2
skennington said:
What are your opinions and experiences? My care is a 95 vert with full H/C/I, all forged internals and a V2 making approx 8 lbs of boost (3.00 pulley).

The engine has about 8k on it, just recently changed the oil and used a synthetic for the first time (castol syntec 5w30). I'm experiencing more blow-by with this oil. I have heard some builders swear by dino for boosted cars and others say it doesn't matter.

Just so you know, I have bypassed my pcv and vented to the atmosphere through the valve covers. It has never blown the dipstick ever so I don't feel like the CC pressure is that excessive.

Any and all comments/feedback would be great!

/Steve
Click to expand...

Well my experience with boosted cars isnt as much as N/A. But as far as oil goes yes a synthetic runs naturally thinner then a conventional of the same weight. Maybe you want to try a slightly higher weight synthetic. I personally like synthetic but if your staying on top of the oil changes I dont think theres too big a difference between using synthetic and conventional. Now if it was a turbo car I would definately recommend sticking with synthetic as it is more resistant to keeping its original properties and not breaking down so easily at high temperatures. Im sure more will chime in soon...
 

revhead347

Apparently my ex-husband made that mistake.
20+ Year Stangneter
Jun 14, 2004
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Mar 22, 2010
#3
  • Mar 22, 2010
  • #3
skennington said:
What are your opinions and experiences? My care is a 95 vert with full H/C/I, all forged internals and a V2 making approx 8 lbs of boost (3.00 pulley).

The engine has about 8k on it, just recently changed the oil and used a synthetic for the first time (castol syntec 5w30). I'm experiencing more blow-by with this oil. I have heard some builders swear by dino for boosted cars and others say it doesn't matter.

Just so you know, I have bypassed my pcv and vented to the atmosphere through the valve covers. It has never blown the dipstick ever so I don't feel like the CC pressure is that excessive.

Any and all comments/feedback would be great!

/Steve
Click to expand...

Try a thicker synthetic, like 10W-30. Synthetic oil just about stops your engine from wearing. I always used Synthetic in my Escort, and when I pulled the head off after 200,000 miles, I couldn't find any wear anywhere. Every part looked like it was new.

There is a good chance you are getting blow by because you bypassed your PCV valve. If you don't have a working PCV system, corrosive gasses build up in your engine. The corrosive gasses eat up your piston rings pretty quick. How long have you had the PCV bypassed?

Kurt
 
S

skennington

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Mar 22, 2010
#4
  • Mar 22, 2010
  • #4
revhead347 said:
How long have you had the PCV bypassed?

Kurt
Click to expand...

Not long at all Kurt, less than a 100 miles as the stang is not my DD. I just started noticing more oil vapor after the synthetic was added.

The open air cc vent method is fairly popular with boosted cars. Seems the pcv just can't keep up with the manifold pressure of the blower. This mod is done to avoid positive manifold and crankcase pressure at the same time. Guess i could go with a Supercoupe pcv filter, it's one of those either or things and I would need to plug my valve cover holes to avoid a big vacuum leak.

I'm beginning to think that because it is thinner, more is making it past the rings.

/Steve
 

revhead347

Apparently my ex-husband made that mistake.
20+ Year Stangneter
Jun 14, 2004
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Acworth, GA
Mar 22, 2010
#5
  • Mar 22, 2010
  • #5
Yeah, it wouldn't have corroded that fast. I would just try a thicker synthetic. I've heard of people using the SC PCV valves. There comes a point where those start to fail though. There are better check valves available, you can also do a crankcase setup into your exhaust collector, or a vacuum pump.

Kurt
 

ProKiller

Founding Member
Apr 26, 2002
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Mar 23, 2010
#6
  • Mar 23, 2010
  • #6
i've alwasy used conventional and haven't had any problems. i've given thought to syth but haven't taken the leap yet. i change the oil regularly enough.
 
G

GDTrumbo

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Jan 22, 2009
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Nashville, TN
Mar 24, 2010
#7
  • Mar 24, 2010
  • #7
skennington said:
Not long at all Kurt, less than a 100 miles as the stang is not my DD. I just started noticing more oil vapor after the synthetic was added.

The open air cc vent method is fairly popular with boosted cars. Seems the pcv just can't keep up with the manifold pressure of the blower. This mod is done to avoid positive manifold and crankcase pressure at the same time. Guess i could go with a Supercoupe pcv filter, it's one of those either or things and I would need to plug my valve cover holes to avoid a big vacuum leak.

I'm beginning to think that because it is thinner, more is making it past the rings.

/Steve
Click to expand...

It's not because it's actually thinner. The molecules in the synthetics are of a more consistant size than the conventional oils. You will always use a bit more between oil changes with it. I would stick with the synthetics w/ boost and try a 10W-30/40 weight.

GT
 
S

skennington

New Member
Sep 1, 2009
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Charlotte,NC
Mar 25, 2010
#8
  • Mar 25, 2010
  • #8
GDTrumbo said:
It's not because it's actually thinner. The molecules in the synthetics are of a more consistant size than the conventional oils. You will always use a bit more between oil changes with it. I would stick with the synthetics w/ boost and try a 10W-30/40 weight.

GT
Click to expand...


You are correct kind sir Although Vortech recommends conventional. They said the detergents in synthetics were harder on the blower seals.
I think I'm still going to try a heavier weight synthetic and see if that corrects the oil vapor issue.
 
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