Oil, Synthetic Vs Conventional With Boost

[skennington]

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]

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

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]

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

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

 

[skennington]

How long have you had the PCV bypassed?

Kurt

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]

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]

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.

 

[GDTrumbo]

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

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

 

[skennington]

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

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.