Pre-Mix

rx4ur7 · 10-08-2009, 06:00 PM

TT writes it up good on the stock system. Note that every body change there was a change in metering rates. 68/78 used a ~quart in a thousand. (One of the reasons we had so many motors go off back then. Drove it for 5k miles and the light came on then the motor stopped. Bad idea having the low level sensor in the bottom of the pan and having these Americans that traded their 66 chevys in that had 150k where they never changed the oil.
But that is another story.)
79 to 85 were suppose to use quart in 1500/2000.
86/91 quart in 3000.
93/95 US quart in 4 to 5k Far to lean for my liking especially here in the desert.
I set up all my client motors to use more and if they drive hard, use premix.
TT's suggestion is fine.
All race motors from here run 100:1 Redline two-stroke race oil. From Showroom stock to GT. Never had a lean burn condition or abnormal wear issue.

What I found in over 35 years building motors (30 out here) is that the metering system on all client cars was sufficient, as long as they used mazda oil filters, quality oil and changed it every 3k miles for NA and 1500 miles or when the oil takes on any color for those with hair dryers. Never let it go black. Seeing 150/200k on client cars is not uncommon. Original equipment or built new.
For those using sticking with electronic injection, easiest is to just use TT's formula. Use mazda filter and change your oil. They are your cheapest insurance.
BTW: Castrol GTX 20/50 for NA and Castrol 30HD for turbos.

10-08-2009, 06:00 PM	#1
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	TT writes it up good on the stock system. Note that every body change there was a change in metering rates. 68/78 used a ~quart in a thousand. (One of the reasons we had so many motors go off back then. Drove it for 5k miles and the light came on then the motor stopped. Bad idea having the low level sensor in the bottom of the pan and having these Americans that traded their 66 chevys in that had 150k where they never changed the oil. But that is another story.) 79 to 85 were suppose to use quart in 1500/2000. 86/91 quart in 3000. 93/95 US quart in 4 to 5k Far to lean for my liking especially here in the desert. I set up all my client motors to use more and if they drive hard, use premix. TT's suggestion is fine. All race motors from here run 100:1 Redline two-stroke race oil. From Showroom stock to GT. Never had a lean burn condition or abnormal wear issue. What I found in over 35 years building motors (30 out here) is that the metering system on all client cars was sufficient, as long as they used mazda oil filters, quality oil and changed it every 3k miles for NA and 1500 miles or when the oil takes on any color for those with hair dryers. Never let it go black. Seeing 150/200k on client cars is not uncommon. Original equipment or built new. For those using sticking with electronic injection, easiest is to just use TT's formula. Use mazda filter and change your oil. They are your cheapest insurance. BTW: Castrol GTX 20/50 for NA and Castrol 30HD for turbos. Last edited by rx4ur7; 10-08-2009 at 06:15 PM.