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SVT Shelby GT500
Motorcraft 5W50 VOA
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<blockquote data-quote="UnleashedBeast" data-source="post: 10307311" data-attributes="member: 112023"><p>I've had a few days now to review the results of AMSOIL 10W-40 in my GT500, and I can't smile any larger. </p><p></p><p>The cold start lugging (32*F and lower) I was experiencing with 20W-50 is all gone. It started just fine with 20W-50, but you could tell it had a little added resistance in freezing temperatures. This was not an issue at warm temperatures that are more common to Florida. Like today, temperatures are in the 60's and rising. This is why I do not recommend AMSOIL 20W-50 during the winter months for those of you who do not store their cars. </p><p></p><p>The engine is so quiet at idle with 10W-40, if it wasn't for injector tick, exhaust note, and supercharger whistle, I couldn't tell the engine was even running. The previous fill of 20W-50 was quieter than the factory fill of 5W-50, but the 10W-40 is clearly the winner in the idle valve train silence department. </p><p></p><p>I wish I would have data logged engine coolant temperatures with the previous fill of 5W-50 and 20W-50. Then I would have had a base line to see if ECT's dropped due to less friction and resistance. Oh well....maybe another car, as I already know the 10W-40 is the ticket for this engine. </p><p></p><p>I have a <a href="http://www.fuelly.com/driver/unleashedbeast/mustang-2" target="_blank">Fuelly.com</a> account for all of my cars, and I'm very anal about tracking fuel mileage. I'm expecting my fuel mileage to trend upwards after the change to 10W-40 for a few reasons. </p><p></p><p>1. 10W-40 provides less resistance versus 20W-50. </p><p>2. 10W-40 (group IV/V) provides less friction and resistance versus 5W-50 (group III) even after the 5W-50 has sheared to a heavy 30 grade. </p><p>3. Less resistance on start up versus 20W-50, and possibly 5W-50 (group III) due to superior base stocks. </p><p></p><p>I will keep all members here who are interested updated on fuel mileage gains. Sunday I have to take my kids on a long road trip. It's the perfect chance to test mileage gains, as this trip is the mirror trip, distance, and temperatures from last Sunday.</p></blockquote><p></p>
[QUOTE="UnleashedBeast, post: 10307311, member: 112023"] I've had a few days now to review the results of AMSOIL 10W-40 in my GT500, and I can't smile any larger. The cold start lugging (32*F and lower) I was experiencing with 20W-50 is all gone. It started just fine with 20W-50, but you could tell it had a little added resistance in freezing temperatures. This was not an issue at warm temperatures that are more common to Florida. Like today, temperatures are in the 60's and rising. This is why I do not recommend AMSOIL 20W-50 during the winter months for those of you who do not store their cars. The engine is so quiet at idle with 10W-40, if it wasn't for injector tick, exhaust note, and supercharger whistle, I couldn't tell the engine was even running. The previous fill of 20W-50 was quieter than the factory fill of 5W-50, but the 10W-40 is clearly the winner in the idle valve train silence department. I wish I would have data logged engine coolant temperatures with the previous fill of 5W-50 and 20W-50. Then I would have had a base line to see if ECT's dropped due to less friction and resistance. Oh well....maybe another car, as I already know the 10W-40 is the ticket for this engine. I have a [URL="http://www.fuelly.com/driver/unleashedbeast/mustang-2"]Fuelly.com[/URL] account for all of my cars, and I'm very anal about tracking fuel mileage. I'm expecting my fuel mileage to trend upwards after the change to 10W-40 for a few reasons. 1. 10W-40 provides less resistance versus 20W-50. 2. 10W-40 (group IV/V) provides less friction and resistance versus 5W-50 (group III) even after the 5W-50 has sheared to a heavy 30 grade. 3. Less resistance on start up versus 20W-50, and possibly 5W-50 (group III) due to superior base stocks. I will keep all members here who are interested updated on fuel mileage gains. Sunday I have to take my kids on a long road trip. It's the perfect chance to test mileage gains, as this trip is the mirror trip, distance, and temperatures from last Sunday. [/QUOTE]
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