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'79 Bronco Oil Weight

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Old 12-18-2014, 03:57 PM
bills86f150 bills86f150 is offline
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'79 Bronco Oil Weight

I recently bought a 1979 Bronco with the original 400 V8 and have noticed a ticking sound when the truck is first started cold. It last for 4-5 seconds then goes away. I'm running 20w50 and a FL1A filter. Is the oil too heavy for it?

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Old 12-18-2014, 09:13 PM
SDDL-UP SDDL-UP is offline
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My Chilton manual states 20W-50 is okay if you never see temps below 20 deg. F, also shows 10W-30 or 10W-40 good for zero to 100 deg.

I would probably try 10W-40 at your next oil change and just see how you like it. It will protect you engine just fine and may pump to critical areas a little quicker. The downside is you may have slightly lower oil pressure once the engine is hot, depending on clearances.
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Old 12-19-2014, 03:26 PM
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I run 20w50 in my 78 Bronco's 351M but only because its wore out with oil pressure problems. Everything else gets 10w40 or 15w40.
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Old 12-19-2014, 08:15 PM
bills86f150 bills86f150 is offline
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I tried some 10w30 and it's slower to build up pressure according to the gauge but it no longer has the "no oil" sound that it had when running 20w50 cold
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Old 12-23-2014, 07:08 PM
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I've been running Chevron 15w40 diesel oil with Lucas oil stabilizer in my 79 Bronco with a 460. Its pretty much a dedicated wheeler so it gets run hard. No problems here!
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Old 12-23-2014, 07:47 PM
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A start up ticking sound would be heard in my older higher mileage Ford trucks when they needed an oil change. Changing it would solve this.
Running a thinner oil wouldn't be the solution to ticking imo.
How's your oil pressure?
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Old 12-24-2014, 12:56 AM
bills86f150 bills86f150 is offline
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It has the stock gauge and reads between O and A in normal
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Old 12-24-2014, 06:05 AM
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I wouldn't trust the stock gauge and really see what it is.
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Old 12-24-2014, 06:05 AM
 
 
 
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