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06-14-2019, 06:36 PM | #61 |
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Re: STP and Transmission: any negative experience ?
More likely the "time" involved was the time necessary to "heat" the oil to operating temperature.
I know even with my STP - the first 400 yards of driving is a miserable gear change. Then it sort of "loosens up" and becomes more normal. Not a lot of gear clash - and yes, as I drive and re-attune myself to the car I clash less. Joe K
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06-15-2019, 01:23 AM | #62 |
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Re: STP and Transmission: any negative experience ?
I agree with Joe K. I use a mix of Mobil 680, STP and Moly disulphide. First thing when it is really thick the gears slow down so fast when you de clutch that I can just whisk it through like a synchro box -Straight through as fast as you can. After a few minutes the lube warms and thins and gears slow down less rapidly and then normal double de-clutching becomes necessary.
This cold oil experience proves that thicker oils change easier than SAE 140 or 190 in my opinion. I tested and set my brew to an SAE 280 viscosity spec, with higher viscosity index (less reduction in viscosity with increasing temperature) than the raw Mobil 680, due to the added STP SAJ in NZ |
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06-15-2019, 02:31 AM | #63 | |
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Re: STP and Transmission: any negative experience ?
Quote:
Good that you opened your mind and didn't join the STP bandwagon but you chose a ISO 1500 oil, the thickest possible gear oil, while you don't live in a hot climate area; see: https://cglapps.chevron.com/msdspds/...&docFormat=PDF Meropa 1000 or 680 would have been better for you but it's not sold in quart bottles as far as I know Do you plan to use your A in cold weather? If yes, you could perhaps mix in some of the supplier's "600W" or better yet Lubriplate SPO-299 or SPO-288, or Amsoil SAE190 or SAE250.
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Last edited by M2M; 06-15-2019 at 02:41 AM. |
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06-15-2019, 03:17 AM | #64 | |
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Re: STP and Transmission: any negative experience ?
Quote:
How did you come up with the SAE 280 figure for your brew? Does adding STP increase or decrease the viscosity index (a measure of the quality of the oil)?
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06-15-2019, 05:50 AM | #65 | |
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Re: STP and Transmission: any negative experience ?
Quote:
Nevertheless temperatures in October/November could be around 8 Celcius/46 F or lower. If I start to see that the Meropa 1500 affects the shifting then I will mix it with the 600W, as suggested, like 50/50. In my club there is only 1 member using STP mixed with 600W (50/50). If that ratio is working for him with MA temperatures, I suspect that the mix of Meropa 1500 and 600W will work too. I also read a posting of 2 members using STP, one living in CT and the other in NH. They have too my temperatures. If STP density is working for them, could be the Meropa 1500 will work for me. I will see. Today will be a normal June day with good temperatures and no rain (finally :-) ). Temperature will be between 18C/64F and 23C/73F . In a couple of hours I will drove the A ~30 miles to the Model A club picnic. All backroads and i will get the true feeling if I am happy with my decision (at least for the summer). Thank you for proving your experts comments. I learn from every posting. Will let you all know what happened. Best Daniel |
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06-15-2019, 09:27 AM | #66 |
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Re: STP and Transmission: any negative experience ?
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To those with grinding gears: Shift slowly, you don't have synchronizers, and remember, get into second right away. First is only needed to get her rolling, then move up to second. Second to third, just slow down your shifting and you won't be grinding. (And as previously mentioned, a nice low idle speed to allow the gears to align helps a lot.) The biggest problem with using STP is cleaning up after getting near the stuff. A trans full of it is a sticky messy proposition, when you have to work on it. Plus, it is a bit thicker than needed. Just my opinion...
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Corley ----------------- Subscribed to the KISS principle! Last edited by Corley; 06-15-2019 at 06:18 PM. |
06-15-2019, 10:29 AM | #67 |
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Re: STP and Transmission: any negative experience ?
M2M. If you are asking how I got SAE 280 viscosity I used a Brookfield viscometer to return the Mobil 680 to its original viscosity after adding a percentage (I think 10% from memory) of MoS2 oil and then adding STP oil treatment to thicken back up. STP polymers increase the viscosity with temperature index.
I am in Canada at present so don't have access to my laboratory books. I made 20 litres up years ago and other club members have been using it up too. I had a full oil lab then since I manufactured oils and greases under the Rocol brand. I still have viscometers but no longer other lubricant testing gear. If you are asking why I chose SAE280 viscosity spec. it was simple because that is what the original 600W oil viscosity was as far as I recall without access to my notes from many years ago. I did not spend any time on researching and testing, just made the mix and found it worked better than that from one of the parts suppliers. Plus I studied tribology when it was a new science in the early 60s and have experience of gear lubes from my manufacturing days. SAJ in NZ |
06-15-2019, 06:47 PM | #68 |
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Re: STP and Transmission: any negative experience ?
Drove 60 miles today with the Meropa 1500 and haven't seen/feel any difference with the 600W, from one of my local model A parts sellers, when shifting.
It is a learning curve. Best to all, this is the end, for me, of this threads. You guys can continue posting. Interesting comments on the last postings. Daniel |
06-15-2019, 11:56 PM | #69 | |
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Re: STP and Transmission: any negative experience ?
Quote:
SAJ, if you can find the info that says original 600W is SAE 280 I'd be very interested in that...that's always been a mystery in 600w discussions. Does anyone know how hot the gear oil usually gets inside a transmission and inside a differential?
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06-16-2019, 07:07 AM | #70 | |
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Re: STP and Transmission: any negative experience ?
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Terry |
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06-16-2019, 08:57 AM | #71 |
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Re: STP and Transmission: any negative experience ?
After a 17 mile drive at 85* my rear axle temp was still below 100*.
I didn't shoot the tranny temp. BTW, I like MMO, STP, and Sea Foam. They've all done good things, just as they are supposed to. |
06-22-2019, 11:16 AM | #72 | |
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Re: STP and Transmission: any negative experience ?
Quote:
Thanks Terry for the info but wouldn't the temperature of the oil inside the tranny be significantly higher rather than slightly higher?
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06-23-2019, 07:19 AM | #73 | |
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Re: STP and Transmission: any negative experience ?
Quote:
Terry |
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