here are my two favorite conspiracy theories list yours
1 air filter oil collects dirt so you clean it more and hence wearing it out needing more regular replacment of air filter.
2 valve master unleaded fuel additive,why do we need to add a additve to leaded vehicles now running on unleaded,when HQ holdens and valiant taxis were converted to gas they did 100000 miles with no additives to replace the lead and with no head or valve changes
1 air filter oil collects dirt so you clean it more and hence wearing it out needing more regular replacment of air filter.
2 valve master unleaded fuel additive,why do we need to add a additve to leaded vehicles now running on unleaded,when HQ holdens and valiant taxis were converted to gas they did 100000 miles with no additives to replace the lead and with no head or valve changes