I tend to agree. The benefit is likely to be marginal on an engine that has proven itself to be extremely reliable as is. It might be fun to contemplate but the potential benefit seems not worth the effort or cost and a slight miscalculation could actually make the reliability worse. As the old saying goes, "don't mess with success." Just my opinion.

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LRG
1987 300D Turbo 175K
2006 Toyota Prius, efficent but no soul
1985 300 TDT(130K miles of trouble free motoring)now sold