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View Full Version : Can of Worms... Again


jhall0711
12-02-2011, 01:44 PM
So I hesitate becuase everyone refers to oil questions as a can of worms, but I searched and couldnt find the exact answer I was looking for, so I shall ask anyway. I have a 1989 ProStar with 351w. I am aware this is a flat tappet motor and would benefit from additional ZDDP. (Assume these facts as settled). Therefore I decided that I want to run Valvaline VR1. I went to parts store and the only weight they carry is the 20w-50. I live in northern Ohio and in the spring it is not what you would call warm. I am concerned this may be too heavy of a weight and wanted some "expert" opinions. How does is compare to a straight 30? (which is what the manual calls for). I know a lot of guys are running that weight I just was unsure about my location.

Thanks

mikeg205
12-02-2011, 01:56 PM
Shell T6 Heavy Duty Engine Oil 5w-40 is what I run. was running Mobil 1- 10w - 40 before but the T6 has 1300 PPM of ZDDP. T6 conforms to the Indmar requirements of SJ/CG4 - Also ran Rotella Triple Protection - but I like the inorganic synth oils overs the dino's... did a ton of reading on www.bobistheoilguy.com.

His website will answer your questions... fun reading.... really - you learn a ton...

TRBenj
12-02-2011, 04:12 PM
I live in northern Ohio and in the spring it is not what you would call warm. I am concerned this may be too heavy of a weight and wanted some "expert" opinions. How does is compare to a straight 30?
Multiweight oils are made from the lighter weight base stock, with modifiers added to make the oil act like it has higher viscosity at higher temperatures. IE, 20w50 is made from 20w oil. At "cold", it acts like 20w oil. At "hot" it acts like 50w oil. By "cold" that generally means 100*F or less. "Hot" is usually ~200*F. Once youre past startup, ambient temps have little to do with how the oil acts- the engine will run at ~160*F (coolant temp) regardless of whether its 100* outside or 50*.

In theory, a 20w50 oil will offer better start up protection than even a straight 30w.

I run VR1 20-50 in New England and have no issues. I know of guys in WI doing the same. VR1 is a great choice for flat tappets as it has high levels of both zinc and phos (1300/1200ppm, IIRC).

TRBenj
12-02-2011, 04:15 PM
Shell T6 Heavy Duty Engine Oil 5w-40 is what I run. was running Mobil 1- 10w - 40 before but the T6 has 1300 PPM of ZDDP.
Hopefully you mean it has 1300ppm of zinc... and you want about as much phosphorus as well. If you have a total of 1300ppm between the 2, that is way below what I would consider sufficient for a flat tappet cam.

I know the 15w50 M1 is still a good choice... not sure about the 10w40.

thatsmrmastercraft
12-02-2011, 04:22 PM
No problems running the 20W-50 Valvoline in Minnesota, though if I were to run it on New Years Day I would put a magnetic oil pan heater on it before I started it to assist with the warm up.

mikeg205
12-02-2011, 05:45 PM
Hopefully you mean it has 1300ppm of zinc... and you want about as much phosphorus as well. If you have a total of 1300ppm between the 2, that is way below what I would consider sufficient for a flat tappet cam.

I know the 15w50 M1 is still a good choice... not sure about the 10w40.

Shell Rotella T6 5w40 VOA ('new' CJ-4 formulation)
Zn 1264 ppm
P 1147 ppm
Mo 59 ppm

Data from blackstone testing...

http://www.bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Main=158546&Number=2330040#Post2330040

mobil one data easier to find...

http://www.mobiloil.com/USA-English/MotorOil/Files/Mobil_1_Product_Guide.pdf

You are sooo right about the zinc and phosporous levels being correct..no if I could find something to run thru the water jack to minimize the rust I would be a real happy camper...

sp00ky
12-02-2011, 09:54 PM
Shell T6 Heavy Duty Engine Oil 5w-40 is what I run. was running Mobil 1- 10w - 40 before but the T6 has 1300 PPM of ZDDP. T6 conforms to the Indmar requirements of SJ/CG4 - Also ran Rotella Triple Protection - but I like the inorganic synth oils overs the dino's... did a ton of reading on www.bobistheoilguy.com.

His website will answer your questions... fun reading.... really - you learn a ton...

I started running 10w30 mobile 1 in my 94 205. But you like shell t6 which is syn as well?