<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr"> We will have to wait until February to run your test again, though we might try keeping the oils in the freezer overnight.</div><div dir="ltr"> I have always used motor oil, of whatever blend was in the engines, but do have a viscosity tale to share.</div><div dir="ltr"> Once I leave my driveway, there is a slight down grade. On cold winter mornings when salt was not on the road, I would drive out and struggle to shift into second at low speed, because the car slowed during slow shifts. When I changed rear axle oil from 90 to synthetic 75-90, the rolling speed dropped imperceptibly. This happened with both TD and MGB.</div><div dir="ltr">Bob</div><div dir="ltr"><br></div><div dir="ltr"><br>On Jun 16, 2021, at 9:54 PM, Max Heim <<a href="mailto:mvheim@sonic.net">mvheim@sonic.net</a>> wrote:<br><br></div><blockquote type="cite"><div dir="ltr"><meta http-equiv="Content-Type" content="text/html; charset=utf-8">As was suggested by one of our esteemed members, I performed a test just now, comparing “Official SU Oil”, 10W30 motor oil, and 75W90 gear oil.<div class=""><br class=""></div><div class="">I poured a line of the oil on a plastic lid, then tilted it to observe the “legs” (to use an oenophile term). As far as I could tell, there was no real difference in how fast they flowed or how “viscous” they appeared. This leads me to believe that any reasonable grade of motor oil would serve the purpose.<br class=""><div class=""><br class=""></div><div class="">But keep in mind that the ambient temperature was 85º F. Now think of your poor carbs in a cold garage in Maine, or Wisconsin, in February. I am wondering how stiff the gear oil would be under those circumstances.</div><div class=""><br class=""><div class="">
<div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="color: rgb(0, 0, 0); letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class=""><div style="margin: 0px; font-size: 13px;" class="">--</div><div style="margin: 0px; font-size: 13px; min-height: 16px;" class="">Max Heim</div><div style="margin: 0px; font-size: 13px;" class="">'66 MGB</div></div></div>
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